LulzSec claimed to have stolen and leaked the login and password information for approximately 62,000 "internet accounts," reports the CBC. The stolen info is said to comprise logins/passwords from Facebook, Twitter, "dating sites," PayPal and, notoriously, Xbox Live. It is also claimed that the majority of accounts are from the United states, though several other countries are named in the report.
Microsoft has released a statement, which states that Xbox Live was not compromised to the best of Microsoft's knowledge, and the logins/passwords were released at random, with people encouraged to try said information on services like Xbox Live (among others).
"This group appears to have posted a list of thousands of potential email addresses and passwords, and encouraged users to try them across various online sites like Xbox Live in the event one of the users happens to use the same password and email address combination. At this time we do not have any evidence Xbox Live has been compromised. However we take the security of our service seriously and work on an ongoing basis to improve it against evolving threats."