To stay cool on Facebook post regularly but not that frequent that people think you are online 24/7
You will be considered as a cool boy as a part of the community if you post something interesting regularly but don’t forget that the cool can transform into uncool too easily if you overdo your participation and get your people all filled with your daily basis problems which everybody have enough on their own. Too manny messages and statuses can develop into the situation when you get start to be boring and moreover annoying for your friends and they may can delete you from their friendlist.
Keep your posts short and pithy
Long posts, if they are not anything super special interesting, are bore and aren’t what Facebook was intended for. Short and sweet and catchy will keep your Facebook reputation cool and you will stay cool on Facebook.