Founders Nation - Find or become a startup cofounder
PenPal World - Connect with people all over the world
Find A Maker - find a partner for your next project
Frysbe - Frysbe: Make global friends at random and the fling app comes up with features to send messages to strangers from every corner of the world to expand your social circle.
CoFoundersLab - Meet 250,000+ entrepreneurs online
Yochat - Yochat app enables users to get to know about strangers from a large number of countries from around the world by video chatting with them.