See possible workarounds/reasons here: https://bugs.launchpad.net/ubuntu/+source/gwibber/+bug/733767/comments/2 https://bugs.launchpad.net/gwibber/+bug/489065/comments/1
Also see Bug #567037 which may be related.
See possible workarounds/reasons here: /bugs.launchpad .net/ubuntu/ +source/ gwibber/ +bug/733767/ comments/ 2 /bugs.launchpad .net/gwibber/ +bug/489065/ comments/ 1
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Also see Bug #567037 which may be related.