Last week, Facebook disabled the application and “single sign on” assistance for the online music streaming program Grooveshark. While Grooveshark initially apologized in a blog post, stating the disabled services really should have been an error on Facebook’s part, Digital Music News verified that Facebook truly cut ties with Grooveshark because of copyright infringement complaint the social media giant obtained.

“We have removed the Grooveshark app because of copyright infringement complaint we received,” Facebook formally stated. Facebook has not yet replied to our request for more comment.

Right now, customers can not sign into Grooveshark with a Facebook password, or post tracks on Facebook by its Grooveshark Facebook application. Grooveshark has not made any public claims since the blog post last week, which incorrectly stated, “We think [the services] were disabled by mistake and we are in communication with Facebook to try to understand exactly what’s happening, therefore we expect to notice a resolution to these types of problems soon.” The post also stated Grooveshark issued a temporary fix to the single sign-on issue, permitting those users with Facebook log-ins to sign on with their e-mail deals with.

The online music streaming program has been the target of a lot of copyright infringement complaints where very similar services such as Rdio and Spotify haven’t, in part since Grooveshark enables users to upload their own music and share it with other people. While Grooveshark states it takes down tracks responding to DCMA infringement notices, that hasn’t stopped the service from engaging in hot water with four major record labels (EMI, Universal, Sony, and Warner) earlier this year.

Facebook’s current move offers to cause huge headaches for the already embattled Grooveshark. Plus some companies may be concerned by the fact that Facebook can, unexpectedly, revoke accessibility log-in service that they rely on to authenticate large portions of customers every day.

When Ars asked a spokesperson for Grooveshark whether the company was doing almost anything to rectify its Facebook issues, she replied that Grooveshark was not sharing any details beyond Facebook’s general public statement citing a copyright infringement complaint.