I am much more skeptical of using FB connect than using Twitter for authentication as a user. I guess this is because connecting my Facebook account will mean

I am much more skeptical of using FB connect than using Twitter for authentication as a user. I guess this is because connecting my Facebook account will mean that I am sharing a lot of new information about myself with the service whereas with something like Twitter there's just the authentication bit that's shared - there's no new data that now becomes available to speak off. My tweets were already public.