LinkedIn and AOL Form Agreement to Enhance Business Communication Via Profile Integration and Presence Services

"LinkedIn Corporation, operator of the world's largest business network, today announced that it has signed an agreement with America Online, Inc. to integrate its AIM(R) service into LinkedIn to provide LinkedIn users with AIM presence information, so that they can easily see when their LinkedIn connections are online and available for real-time communications. This new capability for instant text, voice and video communication will give the more than 3.8 million LinkedIn users a new way to maintain and strengthen their relationships with relevant business contacts, such as clients, business partners and former co-workers. "

[Press Release]

Friendster, myspace have this feature but have built it internally.