I might be regarded as being part of the "grammar police," but even I have limits. I'd exclude
personal ads and the related
webcam forums. Those are informal by design. Since I might be picayune I'll critique one of your ads.

hey looking for a big girl in wa. 18 M 7-5 looking for well stacked and nice big azz for me to fuck all night. love BBW so let me know. also milfs welocom hit me up love a women with some know how
I'll let 'azz' slide because I think you're being intentionally cute.
*partly successful* That's leaves only one misspelled word: welocom. As they say, WTF? Only one ... I've done worse than that and I use a spell checker for longer posts! It would have helped clarity to put a comma after "welocom" and one after "hit me up".
Overall not too bad. I've seen worse in the
healthy penis forum.