Everyone knows what wikipedia is! It is one of the popular(NPO) and largest online encyclopedia having over 40 lakh articles. I am using Wikipedia since I was in 10th standard(2008). I remember I used Wikipedia first time for my school project on environment subject. Now I use it daily. I am pretty much active on English and Marathi wikipedia. Sometime I write and edit articles which are missing in both English and Marathi wikipedia. I like to give my contribution to them because it helps me to spread the knowledge to other netizens. I frequently use wikipedia to clear my technical concepts related to computer science field. In the short word it is a knowledge hub for everyone who has internet accessibility. There is not like worst aspects of wikipedia as critical articles need to be edited only by authorized registered users with proper references. Love you wikipedia and many many returns of the day!