There are lots of social networks, mainly multinational, in and/or outside America - or should I say the Americas?
Here's a list:
Xing (founded in Germany) - http://www.socialmediatoday.com/social-networks/2015-04-13/worlds-21-most-important-social-media-sites-and-apps-2015
Renren (founded in China) - https://en.wikipedia.org/wiki/Renren
Twoo (founded in Belgium) - https://en.wikipedia.org/wiki/Twoo.com
There are tons of them, but none that I am familiar enough with to recommend.
Every SNWS I've been a member of at one time has been dominated by American'sĀ