Little is known about the counteracting influences of different recommending information in various presentation modes on Internet users' selection of content. Considering user-contributed video selection, this study examines how content introductions supplied by contributors (as video descriptions), system-aggregated user popularity signals, and a hybrid of system-and user-generated introduction-the thumbnail preview-contribute to or compete with bandwagon effects on video viewing selections. Based on data from a video-sharing site, the analysis detects bandwagon effects from incidental aggregated user responses: When a video displays a high view count, its popularity over others snowballs further. The bandwagon effect is moderated by thumbnail use regardless of textual introductions, and by text when no thumbnail appears.Key words: User-generated videos, Informational modality, Imagery domination, Inter-modal counteraction, Content uncertainty, Popularity cues, Bandwagon effect doi:10.1111/j. 1083-6101.2012.01593.x Visitors to user-generated content (UGC) websites are confronted with extensive uncertainty in selecting what content to consume (e.g., Flanagin & Metzger, 2008). Mass-amateurized content appears in vast quantities and lasts indefinitely, with value and relevance unknown or unpredictable to users. Site visitors, with limited prior knowledge of the offerings available, operate predominantly by finding what interests them through searching and browsing on a site.1 To assist users in finding appealing content, UGC sites customarily exhibit a range of introductory information attached to the various content items on catalogue, search pages, recommendation panes, or on the playback pages where content (such as a video) appear. Such information provides possibly the only knowledge within a user's reach and is vital to his or her searching and choosing videos in the face of an explosion of choices.There are both user-generated, system-generated, and hybrid cues about available content. The former are what a contributor writes to describe what the content contains verbally by such means as titles, keywords, and summaries. On user-generated video (UGV) platforms, introductions to a video can appear in a hybrid mode as well: It may include a thumbnail, which is a still or moving picture as a sample of the video footage. The graphics afford a preview of the video clip which may suggest its relevance and appeal. Both user-generated texts and thumbnails inform the prospective viewer about what to expect from the video before viewing it. Additionally, system-generated signals encompass popularity metrics including incidental aggregated user representations (Walther & Jang, this issue) such as view counts and downloads, and deliberate aggregated user representations such as likes or ratings, as well as user feedback such as recommendations or comments. They convey impressions of value to users intuitively. Web technologies such as filtering algorithms and interface ergonomics lead uncertain visitors toward peer...