CSG is correct. If you are on a portable device, 1337 is acceptable but not if you have a keyboard avaliable, then proper grammar should be utilised.

Meh, I use proper grammar when I'm on a portable device. xD
If I don't it bothers me.

I always use it. Even in texts to people. I just can't stand it when people want to be taken seriously and they type like that.

I'll talk with bad grammar in a spam thread or if I'm just joking around with people, but when I want to be taken seriously or not sound like a complete moron, I'll always use proper grammar.

It should always be used unless you are purposefully trying to sound like an idiot.

I use a mix of all really, i use commas; as you can see and all the correct punctuation and CAPITAL letters and i don't say things like u or r, they just belittle your inteligence. You should try and keep your appearence up. like dressing correctly.

It's so annoying when some uses capitals and 1337 speak every time then chat too you!

Grammar <3

I hate when people spell like idiots and don't even try to use grammar. They say it's because it's faster to type, but I don't think so. When people do type like morons, it annoys me, a lot. ;)

I agree i also think it depends on the situation.