The main issue I have with Facebook is that their goal is diametrically opposed to the concept of the Internet that I would subscribe to. They are actively working toward attaining a monopoly for online social activity. In a sense, they want to become the "social wrapper" for everything that is done on the Internet.

I completely deleted my Facebook account a few weeks ago and quickly am realizing how far-reaching their monopoly already is.

This point alone - which doesn't even include the many, many privacy issues FB has - is enough for me to say I will not use a service that requires a FB login.