J. Aberg and N. Et-shahmehri, An empirical study of human Web assistants, Proceedings of the SIGCHI conference on Human factors in computing systems , CHI '01, 2001.
DOI : 10.1145/365024.365305

P. A. Allen, M. Mcneal, and D. Et-kvak, Perhaps the lexicon is coded as a function of word frequency, Journal of Memory and Language, vol.31, issue.6, pp.31-826, 1992.
DOI : 10.1016/0749-596X(92)90041-U

S. Ansari, S. Essegaier, and R. Et-kohli, Internet Recommendation Systems, Internet recommendations systems, pp.363-375, 2000.
DOI : 10.1509/jmkr.37.3.363.18779

F. D. Davis, Perceived Usefulness, Perceived Ease of Use, and User Acceptance of Information Technology, MIS Quarterly, vol.13, issue.3, pp.319-340, 1989.
DOI : 10.2307/249008

D. Greef, P. Et-ijsselsteijn, and W. , Social presence in the photoshare teleapplication, Third International Presence Workshop, 2000.

A. Desrochers, A. Paivio, and S. Et-desrochers, L'effet de la fréquence d'usage des mots inanimés et de la valeur prédictive de leur terminaison sur l'identification du genre grammatical, Revue Canadienne de Psychologie, pp.62-73, 1989.

W. Duan, B. Gu, and A. B. Et-whinston, Do online reviews matter? An empirical investigation of panel data, Decision Support Systems, pp.1007-1016, 2008.

D. Eccleston and L. Et-griseri, Forum ??? How does Web 2.0 stretch traditional influencing patterns?, International Journal of Market Research, vol.50, issue.5, pp.591-616
DOI : 10.2501/S1470785308200055

A. W. Ellis and D. Et-miller, Left and wrong in adverts: Neuropsychological correlates of aesthetic preference, British Journal of Psychology, vol.72, issue.2, pp.225-230, 1981.
DOI : 10.1111/j.2044-8295.1981.tb02180.x

M. S. Featherman, J. S. Valacich, and J. D. Wells, Is that authentic or artificial? Understanding consumer perceptions of risk in e-service encounters, Information Systems Journal, vol.16, issue.2, pp.107-134, 2006.
DOI : 10.1111/j.1365-2575.2006.00211.x

L. Feick and R. A. Et-higie, The Effects of Preference Heterogeneity and Source Characteristics on Ad Processing and Judgements about Endorsers, Journal of Advertising, vol.15, issue.2, pp.9-24, 1992.
DOI : 10.1080/00913367.1990.10673175

A. F. Firat, N. Dholakia, and A. Venkatesh, Marketing in a postmodern world, Marketing in a post modern world, pp.40-56, 1995.
DOI : 10.1108/03090569510075334

R. T. Frambach, H. C. Roest, and T. V. Et-krishnan, The impact of consumer Internet experience on channel preference and usage intentions across the different stages of the buying process, Journal of Interactive Marketing, vol.21, issue.2, pp.26-41, 2007.
DOI : 10.1002/dir.20079

C. Fuchs, E. Prandelli, and M. Et-schreier, The Psychological Effects of Empowerment Strategies on Consumers' Product Demand, Journal of Marketing, vol.74, issue.1, pp.65-79, 2010.
DOI : 10.1509/jmkg.74.1.65

D. Gefen and D. W. Et-straub, Gender Differences in the Perception and Use of E-Mail: An Extension to the Technology Acceptance Model, MIS Quarterly, vol.21, issue.4, pp.389-400, 1997.
DOI : 10.2307/249720

D. Gefen and D. W. Et-straub, Trust and TAM in online shopping: an integrated model, MIS Quarterly, vol.27, issue.1, pp.51-90, 2003.

D. Gefen and D. W. Et-straub, Consumer trust in B2C e-Commerce and the importance of social presence: experiments in e-Products and e-Services, Omega, vol.32, issue.6, pp.407-424, 2004.
DOI : 10.1016/j.omega.2004.01.006

R. G. Hass, Effects of source characteristics on cognitive response and persuasion, Cognitive responses in persuasion, 1981.

K. Hassanein and M. Et-head, The Impact of Infusing Social Presence in the Web Interface: An Investigation Across Product Types, International Journal of Electronic Commerce, vol.10, issue.2, pp.31-55, 2005.
DOI : 10.2753/JEC1086-4415100202

C. Balagué and L. Et-florès, Buzz on line : quel impact sur les entrées des films de cinéma?, 23 e Congrès international de l'Association Française du Marketing, 2007.

B. Belvaux and S. Et-marteaux, Les recommandations d'internautes comme source d'information. Quel impact sur les entrees des films au cinema?, Recherche et Applications en Marketing, pp.65-82, 2007.
DOI : 10.1177/076737010702200305

URL : https://hal.archives-ouvertes.fr/halshs-00260108

B. Bickart and R. M. Et-schindler, Internet forums as influential sources of consumer information, Journal of Interactive Marketing, vol.15, issue.3, pp.31-40, 2001.
DOI : 10.1002/dir.1014

F. Biocca, J. K. Burgoon, C. Harms, and M. Et-stonner, Criteria and scope conditions for a theory and measure of social presence, Actes de la Conférence Présence Criteria for a theory and measure of social presence, Presence: Teleoperators and Virtual Environments, Philadelphie, www.mindlab.org Biocca F., Harms C. et Burgoon J.K, vol.12, issue.5, pp.456-480, 2001.

D. Bounie, M. Bourreau, M. Gensollen, and P. Et-waelbroeck, Do Online Customer Reviews Matter? Evidence from the Video Game Industry, SSRN Electronic Journal, 2008.
DOI : 10.2139/ssrn.1091449

F. Bronner and R. Et-de-hoog, Consumer-generated versus marketer-generated websites in consumer decision making, International Journal of Market Research, vol.52, issue.2, pp.231-248, 2010.
DOI : 10.2501/S1470785309201193

J. J. Brown and P. H. Et-reingen, Social Ties and Word-of-Mouth Referral Behavior, Journal of Consumer Research, vol.14, issue.3, pp.350-362, 1987.
DOI : 10.1086/209118

D. Buhalis and R. Et-law, Progress in information technology and tourism management: 20 years on and 10 years after the Internet???The state of eTourism research, Tourism Management, vol.29, issue.4, pp.609-623, 2008.
DOI : 10.1016/j.tourman.2008.01.005

K. Burke and L. Et-chindambaram, How Much Bandwidth Is Enough? A Longitudinal Examination of Media Characteristics and Group Outcomes, MIS Quarterly, vol.23, issue.4, pp.557-580, 1999.
DOI : 10.2307/249489

B. Cassaigne, Le e-commerce a tout changé !, 2010.

Y. Chen and J. Et-xie, Online Consumer Review: Word-of-Mouth as a New Element of Marketing Communication Mix, Management Science, vol.54, issue.3, pp.477-491, 2008.
DOI : 10.1287/mnsc.1070.0810

C. J. Et-mayzlin and D. , The effect of word of mouth on sales: online book reviews, Journal of Marketing Research, vol.43, issue.3, pp.345-354, 2006.

E. K. Clemons, G. Gao, and L. M. Et-hitt, When Online Reviews Meet Hyperdifferentiation: A Study of the Craft Beer Industry, Journal of Management Information Systems, vol.23, issue.2, pp.149-171, 2006.
DOI : 10.2753/MIS0742-1222230207

D. Cyr, K. Hassanein, M. Head, and A. Et-ivanov, The role of social presence in establishing loyalty in e-Service environments, Interacting with Computers, vol.19, issue.1, pp.43-56, 2007.
DOI : 10.1016/j.intcom.2006.07.010

S. Dash and K. B. Et-saji, The Role of Consumer Self-Efficacy and Website Social-Presence in Customers' Adoption of B2C Online Shopping, Journal of International Consumer Marketing, vol.1, issue.2, pp.33-48, 2007.
DOI : 10.1007/BF02249397

F. Biocca and M. R. Levy, Communication in the age of virtual reality

C. W. Park, B. J. Jaworski, and D. J. Mcinnis, Strategic Brand Concept-Image Management, Journal of Marketing, vol.50, issue.4, pp.135-145, 1986.
DOI : 10.2307/1251291

DOI : 10.5465/AMBPP.2005.18781473

F. Pisani and D. Et-piotet, Comment le Web change le monde, l'alchimie des multitudes, 2008.

C. K. Prahalad and V. Et-ramaswamy, Co-creation experiences: The next practice in value creation, Journal of Interactive Marketing, vol.18, issue.3, pp.5-14, 2004.
DOI : 10.1002/dir.20015

L. L. Price, L. F. Feick, and R. A. Et-higie, Preference heterogeneity and coorientation as determinants of perceived informational influence, Journal of Business Research, vol.19, issue.3, pp.227-242, 1989.
DOI : 10.1016/0148-2963(89)90021-0

B. Reeves and C. Et-nass, The media equation: how people treat computers, television and new media like real people and places, 1996.

R. E. Rice, Task Analyzability, Use of New Media, and Effectiveness: A Multi-Site Exploration of Media Richness, Organization Science, vol.3, issue.4, pp.475-500, 1992.
DOI : 10.1287/orsc.3.4.475

E. Sallnas, K. Rassmus-grohn, and C. Et-sjöström, Supporting presence in collaborative environments by haptic force feedback, ACM Transactions on Computer-Human Interaction, vol.7, issue.4, pp.461-476, 2000.
DOI : 10.1145/365058.365086

S. Senecal and J. Et-nantel, The influence of online product recommendations on consumers??? online choices, Journal of Retailing, vol.80, issue.2, pp.159-169, 2004.
DOI : 10.1016/j.jretai.2004.04.001

J. Short, E. Williams, and B. Et-christie, The social psychology of telecommunications, 1976.

D. Smith, S. Menon, and K. Et-sivakumar, Online peer and editorial recommendations, trust, and choice in virtual markets, Journal of Interactive Marketing, vol.19, issue.3, pp.15-37, 2005.
DOI : 10.1002/dir.20041

C. Steinfield, Computer-Mediated Communication in an Organizational Setting: Explaining Task-Related and Socioemotional Uses, Communication yearbook, 1986.
DOI : 10.1080/23808985.1986.11678637

D. Tapscott and D. Williams, Wikinomics, comment l'intelligence collaborative bouleverse l'économie, Village Mondial, 2007.

N. Tractinsky and V. S. Et-rao, Incorporating social dimensions in web-store design, Human Systems Management, pp.105-121, 2001.

K. Hassanein and M. Et-head, Manipulating perceived social presence through the web interface and its impact on attitude towards online shopping, International Journal of Human-Computer Studies, vol.65, issue.8, pp.689-708, 2007.
DOI : 10.1016/j.ijhcs.2006.11.018

A. Helme-guizon, Le comportement du consommateur sur un site marchand est-il fondamentalement different de son comportement en magasin ? Proposition d'un cadre d'apprehension de ses specificites, Recherche et Applications en Marketing, vol.16, issue.3, pp.25-38, 2001.
DOI : 10.1177/076737010101600303

C. Janiszewski, Preconscious Processing Effects: The Independence of Attitude Formation and Conscious Thought, Journal of Consumer Research, vol.15, issue.2, pp.199-209, 1988.
DOI : 10.1086/209157

A. M. Kaplan and M. Et-haenlein, Users of the world, unite! The challenges and opportunities of Social Media, Business Horizons, vol.53, issue.1, pp.59-68, 2010.
DOI : 10.1016/j.bushor.2009.09.003

P. A. Keller and L. G. Block, Vividness Effects: A Resource???Matching Perspective, Journal of Consumer Research, vol.24, issue.3, pp.295-304, 1997.
DOI : 10.1086/209511

S. Y. Komiak and I. Et-benbasat, The effects of personalization and familiarity on trust and adoption of recommendation agents, MIS Quarterly, vol.30, issue.4, pp.941-960, 2006.

N. Kumar and I. Et-benbasat, Research Note: The Influence of Recommendations and Consumer Reviews on Evaluations of Websites, Information Systems Research, vol.17, issue.4, pp.425-439, 2006.
DOI : 10.1287/isre.1060.0107

N. Kumar and I. Et-benbasat, Para-social presence and communication capabilities of a web site, e-Service Journal, pp.5-24, 2002.

N. Kumar and I. Et-benbasat, Para-social presence: a re-conceptualization of 'social presence' to capture the relationship between a Web site and her visitors, Proceedings of the 35th Annual Hawaii International Conference on System Sciences, 2002.
DOI : 10.1109/HICSS.2002.993867

F. Larceneux, Buzz et recommandations sur Internet: quels effets sur le box-office?, Recherche et Applications en Marketing, vol.22, issue.3, pp.46-64, 2007.
DOI : 10.1177/076737010702200304

M. Lombard and T. Et-ditton, At the Heart of It All: The Concept of Presence, Journal of Computer-Mediated Communication, vol.32, issue.1, 1997.
DOI : 10.1111/j.1083-6101.1997.tb00072.x

W. J. Mcguire, The nature of attitudes and attitude change The handbook of social psychology (2 e édition, pp.136-314, 1969.

S. Monsell, M. C. Doyle, and P. N. Haggard, Effects of frequency on visual word recognition tasks: Where are they?, Journal of Experimental Psychology: General, vol.118, issue.1, pp.43-71, 1989.
DOI : 10.1037/0096-3445.118.1.43

C. Nass and J. Et-steuer, Voices, Boxes, and Sources of Messages., Human Communication Research, vol.129, issue.1, pp.504-527, 1993.
DOI : 10.1016/0022-1031(76)90077-9

K. R. Paap and L. S. Et-johansen, The case of the vanishing frequency effect: A retest of the verification model., Journal of Experimental Psychology: Human Perception and Performance, vol.20, issue.6, pp.1129-1157, 1994.
DOI : 10.1037/0096-1523.20.6.1129

M. T. Palmer, Interpersonal communication and virtual reality: mediating interpersonal relationships, 1995.

E. J. Wilson and D. L. Sherrell, Source effects in communication and persuasion research: A meta-analysis of effect size, Journal of the Academy of Marketing Science, vol.12, issue.2, pp.101-112, 1993.
DOI : 10.1007/BF02894421

A. G. Woodside, J. W. Davenport, and . Jr, The Effect of Salesman Similarity and Expertise on Consumer Purchasing Behavior, Journal of Marketing Research, vol.11, issue.2, pp.198-202, 1974.
DOI : 10.2307/3150562

W. M. Van-dolen, P. A. Dabholkar, and K. Et-de-ruyter, La satisfaction envers les discussions en ligne de clients : l'influence des attributs technologiques perçus, des caractéristiques du groupe de discussion et du style de communication du conseiller, Recherche et Applications en Marketing, pp.83-111, 2007.

L. C. Wang, J. Baker, J. A. Wagner, and K. Wakefield, Can a Retail Web Site Be Social?, Journal of Marketing, vol.71, issue.3, pp.143-157, 2007.
DOI : 10.1509/jmkg.71.3.143

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

M. Wiener and A. Et-mehrabian, Language within language: immediacy, a channel in verbal communication, 1968.