These communities are based around an interest like travel, skateboarding, computer games, tv shows, movie stars and so forth. They can be very busy depending on the popularity of the website. Features might include message boards, email groups, news items, resources, member directories, calendar of events, online dating, photo galleries etc.

An online community can moblise a large loyal following for these sites and or brands. E-tailing and online advertising are often good revenue generators for the most popular of these sites.