Remember the LA riots after the Rodney King hearing in mid 90's?
No-one had instant, handheld communication then. It was a matter of enough people pissed off to get out and the street do damage.
I would say it's a non-factor; not just BBM, but Facebook, Twitter, iChat and the like.
If people are going to get out and be destructive (losing a hockey game for God's sake!), they're going to do regardless of how they communicate.
People that aren't prone to idiotic acts of violence or aggression won't take part, whether they get a message on FB or BBM.
Either way, Godspeed and Mind how you go
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