I have installed BBM, Facebook and Twitter on my Blackberry Curve 8520, but i do not get upgrades for any of these three. My other apps get upgrades just not BBM, Facebook or Twitter.

I have been on my computer blackberry app world (online) and i can see the upgrade however when i log on it says "already installed" and it goes back to the older version screen?
The same happens on my mobile blackberry app world?

Please can somebody help me? Is it just my phone, i am ok with it, i dont mind them, it is just more curious more than anything


Thank you guys