After the congratulations post from @crmprogdev for Summer'15 MVP's i googled and learned what MVP is.
I came to know that a user have to be active for atleast 9 days in a month in any channel(Force.com Discussion board, Success Community, Twitter, Facebook, Blogs, etc.,) but Salesforce StackExchange is not there.
Being active only in Salesforce StackExchange will be considered? I like the UI in SFSE than Success community and Force.com Discussion board, so i prefer SFSE over those.
Also why Salesforce not providing by which criteria MVP's are selected(or re-awarded)?
Any inputs are helpful.