The whole math community on the web thing mostly started when Wordpress added support for LaTex (which let them use formula).
There have been some attempts to use Wikis for the same process, but from casual observation they seem to keep returning to using blogs. There is MathOverflow though: http://mathoverflow.net/
There have been some attempts to use Wikis for the same process, but from casual observation they seem to keep returning to using blogs. There is MathOverflow though: http://mathoverflow.net/