Reinventing the wheel. (Score 1)

The FAQ on their site leads me to believe that what is being attempted is not much different from spell and grammar check along with parsing for some teen/street vernacular. If this is the case you are simply going to exclude those with a poor command of English and those who lack the sort of education you get at Ivy League / Oxbridge type institutions. More importantly if the stupidity is algorithmically determined then it can be algorithmically fixed. Thus DumbCheck(Tm) will change LOL to "Your remarks are risible in the extreme". As all readers of this site know stupidity is not the problem. It is trolls, flames and those spoiling for a fight on whatever grounds. "Attitude Filter" seems a much worthier challenge.