Facebook and twitter may simply be the wrong form of login for a business tool. That's partly why I'm biased towards Google, since they have fairly neutral ass

Facebook and twitter may simply be the wrong form of login for a business tool. That's partly why I'm biased towards Google, since they have fairly neutral associations. People don't usually post anything embaressing to google, and so wouldnt be as threatened with a company wanting access to their Google account. On the other hand, more options are more distractions. Email and password is so simple and well understood that it just works.