RadiantEclipseForums.forumotion.com is a cool one!
Computalks.com
ZeroZaku.com
Apocalypseforums.farkbb.com
DevForumz.com
thedaftclub.com (not to be confused with their Daft Club album) is the most popular Daft Punk fan site and forum. But no, it's not official.
There are many Subaru forums online but researching the forum of the Subaru Owners Club site the most popular topic appears to be discussion surrounding the engines and exhausts, and also modifications.
The most popular sports betting forum in the UK is "betting-forum". There are over 14,000 posts, 5403 total topics and 3614 total members on this forum.
Probobly IGN.
The forum on most sites is a place for users to talk to each other, and often to talk to the people who run the site or the game that the forum is about. On WikiAnswers, the forum is a place for people to talk to each other, get advice about using the site, and meet some of the supervisors who help out on the site.
The topics that are on the "LSAT" forum are "Schools to go to" and "LSAT grading". These two subjects are the most popular and most used topics on the "LSAT" forum.
this site is popular in the world, this is all...
There are many free forum scripts. The most popular one by far is phpBB. MyBB is also free and similar to vbulletin. Vanilla is a popular light weight forum.
There are a number of forums that are popular for iPhone users. Some of the most popular forums are the "iPhone Forums", "MacRumors Forum" or the "iLounge Forums".
Apple Insider is a site/forum that deals with news and rumors regarding the Apple company. It does not appear to be an app or any particular software, however you can follow them on Twitter for more updates, so the latter appears to be the popular Social Media forum in question.
Hannah Montana is the most popular
Blogger.com ranks as the 7th most popular site on the internet. Wordpress.com ranks at 19th.