From the The Columbia Guide to Online Style
Blogs and Wikis
Cite blogs or wikis similarly to citing mailing list or newsgroup postings, including the name (or alias) of the author, the title of the posting (if applicable), the title of the site, the date of posting, and the address of the site, followed by the date of access enclosed in parentheses.
Bartow, Ann. â€œParody Is Fair Use!â€ Sivacracy.net. 26 Mar. 2006. http://www.nyu.edu/classes/siva/ (30 Mar. 2006).
Include the name or alias of the author, the date of posting, the title or subject line of the posting (if available), the title of the site, the URL, and the date of access.
Bartow, A. (2006, March 26). Parody is fair use! Sivacracy.net. http://www.nyu.edu/classes/siva/ (30 Mar. 2006).