The social media website designed for virtual world residents and online gamers is now located in Second Life on the region called Earth. http://maps.secondlife.com/
Visitors can find the ATM there to register or get their earnings, change the music as they like and have fun with some board games. Just like on the website people here also can meet others and make new friends.
Avatar Social Network has a location on LittleField grid as well, a community grid without currency where shopping is free. ASN has an entire region designed to hangout for members and regular visitors alike. As the networking website is growing it is taking presence on more and more grids, first with ATMs only and later with hangout spots.
If you are not a member yet, you can join here: https://www.