http://www.forbes.com/sites/davidthier/2015/06/04/these-guys-used-an-absurd-strategy-to-win-in-destinys-iron-banner/
Another article from Forbes showing how many players now are cheating Trials and IB using LFG. Basically you start a match and during the loading screen, cheaters enter their opponents' gamertags on LFG saying things like "will carry PoE lvl 35" and the like to have them bombarded by messages.
Just another reason why LFG should be disbanded and OMM inplemented.
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Turn notifications off while running ToO. Problem solved.