DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.
LiveFyre - livefyre-subscriptions - A isomorphic JavaScript library for managing Subscriptions in Livefyre's Personalized News Stream service.
Tinder - Tinder is how people meet. It's like real life, but better.
IntenseDebate - IntenseDebate's comment system enhances and encourages conversation on your blog or website.
Hinge - Find people you want to date through your friends on Facebook.