I don't know you already fix this problem or not.
I searched several site and finally got an answer for this problem.
Just connect WiFi and let it do whatever it want.
Before I found this, I tried several things;
1. restarted my phone
2. pulled out battery and put back
3. killed the process from task manager
4. removed FB account
5. removed FB app from my phone (actually, back to previous version) and update again
Non of these helped me ever!!!
Also, this problem is not device specific. (I realize it after googling it)
I mean various devices and locations had the same issue.
Anyway, good luck!!!