haha, i think i'm the one who made the "Than / Then" one that you are talking about, its a typo i knew i am wrong but i didn't both editing it.

oh noes grammars O_o, I don't be liking them.

I assumed we were talking about people whose first language is English. Naturally, I'll give English as a second (or third, fourth, whatever) language folks some slack!

Who cares!!!!!!!!! I can't believe people are really bothered buy such small things. I'm not an English major. I make those mistakes all the time,so what!!!!!!!!!!!

effect/affect is my big one, but less/fewer is also annoying.

For the latter:

If the noun it is quantifying has many discrete objects that can be counted (e.g. cups, consoles, days) then use fewer

"Fewer consoles were sold..."

Whereas if the noun is collective and can't be counted (e.g. money, time, disk space)

"Less time was needed..."

Sometimes it can impede or prevent your meaning getting across. Sentences should be clear enough to understand on the first read-through.

'Who cares' and 'so what' need question marks.
You shouldn't use so many exclamation marks.
'by' should be used instead of 'buy'
Maybe a semicolon between "I'm not an English major" and "I make those mistakes"? To show the sentences are linked?

Man,so many English teacher's on a video game forum. lol

Could care less/Couldn't care less is another one :D

Could care less suggests you still have some interest regarding the matter at hand and there is a possiblilty it can go lower.

Couldn't care less shows that as things stand, you are at the bottom of your level of interest i.e your interest in the matter is non-existence...like some people regarding this thread for instance :D

Thanks for correcting me,now I can sleep better at night. lol

Thanks, I can use that when I go back in time to take my english class. lol