“The distributed denial-of-service (DDOS) attacks that knocked out Twitter for hours and affected other sites like Facebook, Google’s Blogger, and LiveJournal on Thursday continued all day Friday and may persist throughout the weekend.”
PCWorld reports.
This is too bad. There are reports that the reasons behind it are politically motivated too. The PCWorld article tells a little more about it.
So, Facebook and Twitter and apparently LiveJournal are acting kind of strange and experiencing intermittent failures. Google owned Blogger seems to be ok.