Some sections of the forum have no post count as they are for spam or fun topics. Post count sections of the forum are for serious threads, or threads which require some effort of thought behind them.
On social groups, your question has been answered but I should point out one thing just in case you are spending all of your points on social groups. Social groups are currently dead and nobody has posted in one (to my knowledge) for months. They're a great concept, but at present the idea hasn't really taken off. Perhaps you and others may change this by joining some groups and starting new discussions, but at present it has yet to really take off as an idea.
Thanks go to Hayabusa and my Secret Scotsman for the sigs.