The profile posts can be used for everything except of technical questions. Time will tell whether it is valuable or not. If not it will be removed from the main page.
Profile posts are more similar to Twitter. They are limited to 140 characters. Its more about sharing your current status then to discuss anything seriously.
erel, only a ideia,
now with basic4ios can u make a division < android ios> on the website enter
and its a good ideia make a publish app like google play
with icons, like http://pt.appszoom.com/
icon + name, to help the users with marketing. the seo of this forum is very good