Johnston Press bans Facebook

Can someone please explain why a newspaper company would ban their staff's access to Facebook?

Well Johnston Press have according to this report from Paid Content

In a memo, (via Allmediascotland), JP management warn reporters that “a recent review” found more than half of the company’s entire outbound traffic is to Facebook so it has no choice but it stop people visiting. the Memo reads: “Journalists who require access should seek approval from their departmental head, who should contact the Group Helpdesk to have the permission restored.”

adding that

Just like Friends Reunited before it, Facebook has become a standard reporting tool for many local and regional reporters—one JP journalist told me recently they couldn’t imagine working without it.