“Twitter was the target of a cyberattack Thursday that disrupted its microblogging service for many users, especially those accessing it directly through the company’s Web site.

The service appeared to be functioning normally on Friday morning.

In a blog post late Thursday evening, Biz Stone, a founder of Twitter, said hackers had changed the records for the company’s Web addresses in the Domain Name System, which function as a directory for handling data requests. The hackers redirected those requests to non-Twitter servers.”

(Twitter Disrupted by Web Attack – Bits Blog – NYTimes.com)