Email replaced snail mail, citizens have turned into netizens and almost every thing is being documented on social media. So much so that we cannot fathom a world without the Internet. While most of us do spend a lot of time on the Web browsing a lot of websites for personal and professional reasons, the Internet remains home to some truly hidden gems. Some of them are really useful, some are really productive and some that will teach you a lot of new things. Here we list out 30 websites that netizens must visit: