On the topic of grammar:
Please take the time to, at the very least, capitalize the first letter of your sentences. It makes identifying each individual sentence much easier. Proper nouns are not a must, as I forget to capitalize them as well, so it's not like I can yell at you for that. However, capitalizing them would still help, though it is by no means necessary.
Please PUNCTUATE. It becomes rather difficult to read if you string together multiple ideas without any sort of break. It takes under a second to type in a period, a comma, or even a semicolon ( ; ) if you're daring.
Abbreviations: Take the extra second, PLEASE, to type the extra two characters. It's nearly effortless to do this, and clears up a good amount of confusion. This includes R, Hu, Wut, Y, U, etc... While abbreviations such as b/c and w/o and IDK etc. are fine, one to two letters is really not asking much.
Spelling: At least make a conscious effort to spell correctly. If you don't know how to spell a word, or if your finger slips, that's fine; but don't rush so much that you start yo splap the ketyboad like this. This is not a race; your post will still get read, and the time you took to spell everything correctly (spellcheck helps too) will make it much easier on everyone else.
1337: 1337 is not cool. It's stupid and difficult to read. Don't try to complicate things by typing in 1337.
Caps Lock: It is not wise to type in ALL CAPS LOCK LIKE THIS! It is annoying and people will think that you are yelling at them. Be wise and look at what you're typing every once in a while, to make sure you didn't accidentally turn caps lock on.
If you just follow those guidelines, not only will everything you type be a lot clearer, but you will also seem more intelligent. (Note: You want to seem intelligent. People will like you more that way.)