I think many people have the wrong idea about this. Let me attempt to clear things up:
You are not going to get gagged (or banned, which is even more unlikely) silly-nilly. A gag happens for a reason: A person has clearly broken some rule. If you are concerned that you may break a rule, here is a link to the rules and a link to the survival guide which explains the rules and how they are applied in context. It explains why certain rules are in place.
These are not even remotely difficult to follow. The main reason gags happen, in my opinion, is that members are too lazy to read all of the rules, or to simply follow the few that exist. Some common ones include typing in caps in the chatter, using text speak, and so on. The chatter is a bit more strict with the rules than the forums- and I think the forums allow for a bit more leniency. It's okay to put things like "lol" or smiley emoticons in your forum posts, like WhiteRav3n said. You aren't going to be in trouble for that. So long as your forum post contains no inappropriate content (cursing and such), is not rude or arguing personally with someone, and is readable, not spam, it will be perfectly fine. So why stop posting?
Nash threw the word banned around a lot. In truth, bans are not common things around here and I don't think members need to be worried of being 'banned'. Follow the rules and you'll be fine. Don't follow the rules, and you'll probably find yourself with a gag. Continually break the rules, even after a gag, and you may find yourself facing a ban. That's the worse-case scenario, and I think it's pretty rare for someone to get to that state.
In all honesty, I don't see the problem and I don't think you need to be worried of being gagged. I think it would be a shame for members to stop posting in the forum for that reason. Post all you want, share all you want, talk all you want. Just make sure to read over the rules and know them- then you'll be fine around here. There really aren't that many. And they really aren't that hard to follow.
As always, if you aren't sure about something or need someone to discuss this with you, I am available and happy to help/answer any question to the best of my ability.