Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Babble - A more personalized social network
Event Hunt - Startups and Tech Events Curated By Locals
LanguageBeast.com - Study English synonyms and antonyms to enrich your vocabulary
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets