Facebook and twitter update problem

It's a bit weird and the exact behavior differs case from case. But the updates are downloaded very rarely and sometimes are not downloaded at all. The manual button doesn't work either.

One case is as follows:
When I log out and log in, after about five minutes the updates downloads. Next download of updates is about an hour later and nothing more (not even after next two hours). I must log out and log in again and wait about five minutes to get new items.