How to create web based messenger

[Inexplicit]

Hi.

In most social networking sites (i.e facebook, hi5, myspace), you enter your email and password to retrieve your contact list automatically.

How do they do that? Thanks in advance.

[iblastoff]

are you asking for what api's they use? or do you literally want to know how to do it? in either case this is probably beyond the scope of a messageboard.