Q:

Please compare Facebook Connect vs Facebook (OpenID+Oauth)?

Possible Duplicate:
Facebook Connect OR Facebook Authorization using OAuth 2.0 

I am getting very confused in the 2 :

Facebook Connect
Facebook (OpenID + OAuth)

In my mind, we can do the same things with both. Authenticate the user and access the private data of the user after authorization.
So, Are they different ?
If yes, then what is the difference between them ?

A:

asking google for "difference between facebook connect and openid" gives you this great artice as one of the first results, wich should answer all of your questions.  
in general: yes, there's a difference. facebook connect offers more information than using openID and...

[...] Instead of just offering credentials, Facebook wanted to offer friend
  access and dynamics to the privacy of the information that simply
  wasn’t possible with the other standards.

EDIT :
if this didn't help you, try to search on SO for questions about the same topic, there are some with really great answers:

What's the difference between OpenID and OAuth?
Facebook Connect OR Facebook Authorization using OAuth 2.0
...

