Facebook has a "black people problem" as the leading tech company fails to give enough support to its black employees or users, a former Facebook employee said in an internal memo publicly released on Tuesday.

In the memo circulated to all Facebook employees early this month shortly before he left the company, Mark Luckie, former strategic partner manager for global influencers at Facebook, wrote that many black people felt they were marginalised and feared to speak up about their experience at the company, Xinhua news agency reported.