The most unique visitors to a personal blog in 24 hours is 230,755 and was achieved by Yusuke Kamiji’s blog (Japan), on 12 April 2008.

Cyber Agent Inc., the operator of the blog media ¡¥Ameba¡¦ measured and collecting the log data.

number of comments: 56,018 comments posted to one article (17th April 2008)
(the link to the article: http://ameblo.jp/kamijiyusuke/entry-10089041905.html)