Twitter

Twitter is a free social networking and micro-blogging service that enables its users to send and read each others' updates, known as tweets.

Myspace

MySpace is a social networking website with an interactive, user-submitted network of friends, personal profiles, blogs, groups, photos, music, and videos for teenagers and adults internationally.

Blogspot

Blogspot is a blog storage service that allows private or multi-user blogs with time-stamped entries.