There are Twitter connection/usage issues at present on shared hosting.
We will intervene.
Update(s):
Date: 2014-04-17 10:23:56 UTC The problem is back again.
We are contacting Twitter about it.
Date: 2014-03-11 20:10:03 UTC + cluster002
Date: 2014-03-11 14:41:16 UTC + cluster003/005/010/014
Date: 2014-03-11 13:34:43 UTC + cluster011/012/013/015
Date: 2014-03-11 12:14:10 UTC The problems only affect read-write access (POST) to the Twitter API.
Read-only access (GET) is working perfectly.
It seems that Twitter has simply blocked the outbound IPs of the clusters.
A solution is currently being deployed on cluster005 and cluster007.