For short form discussion, its fine. For anything long form, its a bit of a pita. A game I backed on KS is using it, and I'm not a fan of using it day to day to try to find information, or carry on a discussion. Time will tell.
Its not PHP/MySQL though, its Ruby/PGSQL, and it looks like it requires 1GB of ram to run out of the box. Which would mean that you're not going to get away with it on any sort of "shared" hosting. You're looking at a proper VPS, or _very_ good shared host.
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