So, that's what we internet people call "spam," usually.
Depends on the instance. Sometimes when they annoy me, I'll use a pet name instead of an expletive. Gets the point across better. Sometimes because I just luffle them so much. And sometimes because it just gives my post a ring to it, and it's a nice change from just using everyone's name.
Luffle.... technically, it's like a combination of huggle and love, but we really just use it as a synonym for love. You'd have to urbandictionary it, though.
I like it when you type properly. There are plenty of reasons to. Makes you sound intelligent, makes people take you seriously, gets you ready for the 'real world,' improves your grammar/spelling/wpm, it's easier on everyone you're talking to.