The most popular social networking site used in Taiwan is PPT, a BBS (bulletin board system) site. Users can log in, read news updates, post pictures, and chat with each other. Facebook isn't the most popular (surprisingly to us Americans) and is only used by 6.2 out of 15.6 million Internet users in the country. It is on the rise, however, and Taiwan's president Ma Ying-jeou just recently joined!
Social networks in Taiwan help people reconnect/stay in touch with friends, post/review resumes and interests of potential employees, raise funds for disasters, and even market and advertise products. In such a technologically advanced country, it's no surprise that social networking is prevalent and on the rise.
http://www.wisegeek.com/what-is-a-bbs.htm
http://www.insidefacebook.com/2010/04/12/does-taiwans-explosive-facebook-growth-mean-more-to-come-in-east-asia/
http://www.bangkokpost.com/tech/computer/218789/taiwan-president-goes-on-facebook
http://www.money-made.net/2010/06/social-networks-in-taiwan-gaining-importance-in-present-times-18.html