My favourites on the list include : Quora which is one of the best collaborations for getting answers on various topics. Because the initial users were added based on word of mouth, the community built doesn’t have many spammers that can otherwise be found on other similar platforms like Yahoo!
Another favourite is Goodreads that allows users to build their own virtual shelves of books and even recommend books to their friends.
As a student, Wikipedia was godsent! I couldn’t have done any of my assignments without the help of wiki 🙂
I am going to check out Coursera that is a site that has partnered with universities and offer online classes for free! The nerd in me is super excited by this new trove of knowledge and the Indian celebrates cos its free!!