Make comments that people are likely to agree with strongly. Correcting grammar usually gets a few reps. Raging, ranting, making long dissertations about why there should not be apostrophes in 'As' and 'Bs' and just plain being an all out Grammar Fuhrer usually gets a tsunami of reps.
P.S. Yes, I realise there were supposed to be two dots about the 'u' in 'Fuhrer'. I don't know how to get those/can't be bothered.