A Strange happening on facebook

[Pak_Track]

okay so i was chatting with my friend on facebook the conversation was like this:

Him:Hi
Me:Hi back
Him: I want u to edit some pics for me
Me: Sure
Him:Give me ur ID and pass (yes this exchange is common in my school)
Me: First u give urs
Him: mohammad.adilrockstar@yahoo.com
Me: Okay *********@gmail.com now give me ur pass
Him: **************
Me: Thanks, goodbye :p
(LOL)

Okay so when i logged in with this it opened up the account(Non SSL) of some girl (a pretty one from my school).

Im pretty sure that he didnt give the wrong specs because hes given this email with a different password and it opened his account. Why do you think this is happening?

BTW Im using firefox and recording absolutely no history or cookies

[namespace7]

Hmm.. I don't really follow what happened.
You logged in to FB using the email and pass you got off him and it was not his but some girl's account?

And whats the problem?

I must be missing something.

[Pak_Track]

the question is :WHY this is happening? not that its a problem for me i just want to know for "educational purposes

[namespace7]

There is no way you can login to a different account using wrong login details. Trust me.

What did happen is the guy got the girls login details and for some weird reason gave them to you. You entered them in fb and logged in to her account. If that was the first time you logged in to her facebook account from that specific computer or browser, then you should have had to answer a few security questions before you could actually access her account (facebook marks every browser that you log in from with a cookie that says that you have logged in before with the same account from that specific browser).

So basically nothing special or unusual happened. You simply logged in to facebook with someone else account. Simple. Now if that account did not belong to the person you thought it belongs to then thats not a technical problem but rather a social or miscommunication problem.