There are a couple actually, but talkSFU is the best :)
I know the CAC (Canadianized Asian Club) has one which is pretty busy...and so does the Computing Science Student Society (http://csss.cs.sfu.ca/forum/).
Even the SFSS has one but it's just a ghost town.
I think SFU's main "forum" is caucus but it's decades old and dead and forgotten (unfortunately) http://caucus.sfu.ca
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I know the CAC (Canadianized Asian Club) has one which is pretty busy...and so does the Computing Science Student Society (http://csss.cs.sfu.ca/forum/).
Even the SFSS has one but it's just a ghost town.
I think SFU's main "forum" is caucus but it's decades old and dead and forgotten (unfortunately) http://caucus.sfu.ca