Peter Burrows reports:
User names and passwords of 20 million visitors to an unidentified dating site have been hacked and offered for sale on a website, according to a posting by the thief on an online forum used by cybercriminals.
[…]
Fifty percent of the credentials were for people based in Russia, and 40 percent came from the European Union.
Read more on Bloomberg Businessweek.
Update: Bloomberg News identifies the site as Topface.