Social media & networking service

Multilingual online encyclopedia

Microblogging and social networking

Anime themed forum

Social networking website

Commercial social networking

Ars Technica OpenForum

Perez Hilton Blog

Ubuntu Forums

Airline industry news

Social news aggregation

Business & employment-oriented

Microblogging & social networking

Social media & networking

Blog-publishing service

Question answering–focused e-business

Japanese blogging host

Question-and-answer

Anonymous English-language imageboards site

Social networking

Knowledge exchange

Wiki hosting service

Question-and-answer

Community weblog