I run a bug tracker for small shops and freelancers (http://trackjumper.com http://trackjumper.com) - right at the border of business vs consumer applications.

I run a bug tracker for small shops and freelancers (http://trackjumper.com http://trackjumper.com) - right at the border of business vs consumer applications. I chose not to integrate any third party logins (facebook especially) for exactly this reason. I did not, however, take the step of advertising it as a "feature". Perhaps I should.