Anyone with some IT background should be familiar with a single point of failure concept. This is why I personally don't use FB Connect, OpenID, etc. If anythin

Anyone with some IT background should be familiar with a single point of failure concept. This is why I personally don't use FB Connect, OpenID, etc. If anything goes wrong with your single global login process, you're in trouble. It doesn't matter whether it was your fault or your provider's. When I create web products, I don't hesitate that much. If people want it and if it can increase signup conversion, then let's roll with it. But I don't use that as an user. A good password manager is more than enough for quick and convenient logging in.