Reddit is one of the biggest internet communities with more than 1.7 billion monthly visits. Here you can find any message boards about comedy, fun, tech, lifestyle, travel and etc. Reddit was ranked as the 5th most visited site in the US and it's continues to grow fast.
Gaia Online is an online hangout, incorporating social networking, forums, gaming and a virtual world. Gai Online was founded in 2003 as a small comic book community, but now it's one of the biggest and most popular Gaming / Anime communities in the word.
An old and popular community, similar to Reddit, where you can post messages and pictures. The main difference from other forums is that you don't even need a 4chan account. All communication takes place anonymously. Most popular boards are Japanese Culture, Video Games, Comics & Cartoons, Television & Film.
d2jsp.org is currently a huge international social network community and trading nexus, which focuses around an economy based on d2jsp Forum Gold. Players can buy and trade Forum Gold for numerous goods and services across a diverse platform of online games and users.
SomethingAwful.com offers daily internet news, reviews of horrible movies, games, and social networking, anime and adult parody, and one of the internet's largest forums covering games, movies, computers, sports, anime, cars, and more.
OffTopic is one of the biggest communities which allows you to discuss all kinds of unrelated stuff. The forum is categorized into 12 different interests, so you can post anything about Art, Cars, Entertainment, Politics, Food, Games, Sports and etc. Offtopic.com currently has more than 360K topics and 16M messages.
Humorous views on interesting, bizarre and amusing articles, submitted by a community of millions of news junkies, with regular Photoshop contests. Amazing community with discussing News, Politics, Sports, Business and other important topics.