Online communities are the groups of web savvy individuals who share communal interests. A community can be developed with just a single topic or by a bunch of philosophies. A better community binds its members through substantial debates. Mathematics is a very popular communal interest and there are hundreds of online communities formed in both Q&A and debate styles. Some mathematical communities are so immense that they serve two or three discussions every minute. If you are a math student, reader or research scholar then you must join in such places. Beyond sharpening math skills, these communities also help users to connect with other similar minded people. The following 8 communities are largest on the internet and are always worth joining:
1.Mathematics Stack Exchange
Stack Exchange is world’s largest Q&A network and the Mathematics community of this network is considered to be one of the most reliable resources for mathematics related information. Mathematics Stack Exchange is a website dedicated to all types of mathematical discussions. You can ask questions, provide answers and communicate with other users publicly.
2. Mathematics Google+ Community
Like the fasted growing social network Google+, Mathematics Google+ community has gained an amazing crowd of over 128 thousands readers in just two years. It supports serious discussions, informative readings, blog articles and multimedia images about math & related sciences.
r/math is probably the wisest sub-reddit of reddit.com. Here you can ask questions and discuss on mathematical internet links.
The MathOverflow is similar to Math.SE in theory, but it allows discussions about serious research topics only.
5. Math Help Forum
A forum dedicated to elementary & recreational mathematics topics.
6. Number Theory LinkedIn Group
Open discussions about theories and new developments in number theory.
7. Mathematicians LinkedIn Group
The basic idea of this community is to bring all the logical brains together and ignite the thought process of learning and teaching Mathematics with all possible practicalities.
Last, and the least
I launched my own Q&A community, Question HUB in March 2014 for private beta and moved all Q&A based articles from the blog to the hub. Now it is open for public beta since 25th July 2014. Question HUB is hosted on gauravtiwari.org and is dedicated primarily to career & education topics, mathematics and WordPress. If you feel interested in joining the HUB, you can register here for free. You will receive your login & password once your account is approved.