Discussion forums has many add values in it. We don't only interact with intelligent persons and get there feedback but also learn thousands of new topics which were unknown for us earlier. Forums keeps your knowledge updated and also helps to submit links of your own site for social advertising.
to learn everything about hacking <related to scripting/coding math, net infrastructure n other stuff>...
to have a blast and also to learn a few things about SEO and other related topics; also the community is friendly !
i am using forum because"to interact with new user and their thoughts about of the related topics....."
some time ago i have found a website saying good things about this one. and said "hey, let's give this thing a shot in this short winter vacation"
well i am here just because i love the community and also there is some nice information that i generally use every time i create a site