Many online communities use various tools to judge the quality of content uploaded to their site. The main source of evalution are approvals of the content by mass users, due to the similiar interests a community holds, therefore usually liking the same material. However, communal evaluation does not work in communities where a broad audience is catered for, though there are online societies which have implemented tools to help in finding quality or interesting material.
Most websites provide a system that allow users to rate content using a star or 'like it/don't like it' system. People can find this when using YouTube to find specific clips. After a search, YouTube will provide an array of clips believed to relate to the content searched for. Users usually select video clips that have a high star rating, because the youtube community has already voted that this video is worth watching. The star system is often used on internet to evaluate the quality of content.
Other systems involve a scale, such as those used in Newgrounds for finding the most popular games, toons and movies submitted by the community. Information aggregator Digg uses the 'share' and 'bury' options for its members to choose between and Current TV to select between 'like' or 'nope' to let the the most interesting stories rise to the top to be broadcast. All of these use a rating system to help find the content that a lot of users wish to view and others that take little interest. The main condition for a system like this is that there is a large enough community to represent fairer evaluations of the content in use. While this system could be manipulated as well, it usually works well in finding content on websites because of this extensive approval process.
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