and yes BF3 will be supporting one also called Battlelog
"Of course there are things we will not be showing at E3, including the game’s extensive co-op campaign, the introduction of Team Death Match mode and the
Battlefield 3 Battlelog web destination – featuring powerful social tools, feeds and detailed player stats. Battlelog also lets you manage your friends lists, squad up, create platoons, use voice chat and follow your friends’ progress in real-time,
and more. Battlelog will be available for the monthly fee of (drum roll)... zero dollars. We look forward to providing more information on these features in the near future!"