Facebook users worldwide rushed onto Twitter on Thursday to vent their dismay — and trade jokes — after a glitch left them briefly unable to reach friends on the social networking giant. Thousands headed to Twitter to make sure they were not alone in their Facebook-free plight, many posting under the hashtag #Facebookdown. Probably be best for society these days if Facebook actually went down, too many people living their lives with phones in hand #facebookdown, wrote Scott King, from the account @ScottKing4. Earlier this morning, we experienced an issue that prevented people from posting to Facebook for a brief period of time, Facebook said in a statement apologising for the incident.