(It is a friendly debate)
It looks like, I have to drop the ideas of developing Facebook Applications.
I do not know the real status of Facebook these days. But in my account, there are too few posts, comments and likes. A lot of friends are not active there. They do not read the posts and in a week, I have too little status changes. That is my personal case.
So, I doubt, if I should try to make use Facebook Apps and integrate them into the websites? Meanwhile twitter has taken the attendance, but some other tools bridge between them. If you post of twitter, they post to facebook, and if you post to facebook, they post to your twitter as well.
Using OOAUTH API, you can post them directly to any one of them.
I would just like to begin a discussion on development, usability and marketing aspects of facebook applications. Can I guarantee more visitors in my websites, if I make facebook logins/registrations? Any statistics?