Web logs or blogs (Personal Web sites) :
- to keep in touch with friends and family
- Blog postings are timestamped
- Readers of these sites are allowed to comment
- Some blogs are with personal information other focus on information about hobby or theme
- Although most are written by individual bloggers, there are also group blogs
- Two of the most widely used are Blogger and WordPress
Microblog :
- publishers short sentences
- to keep friends and other contancts up-to-date
- most popular microblogging site, Twitter
- Twitter enables to add new content from browser, instant messaging application, or a mobile phone
Wiki :
- to allow visitors to fill in missing information
- the simplicity of editing and publishing through wiki software
- support collaborative writing in which there isn't a single expert author
- the most famous example is wikipedia
