Human rights expert to keep Zuckerberg in check

Thomas Hughes previously worked for human rights organisation Article 19

Facebook has picked British human rights expert Thomas Hughes to lead administrative staff of its new oversight board.

The independent board - first announced last September - will have the power to override Facebook decisions on contentious material.

It will review videos, photos, and other content that Facebook removes.

Mr Hughes started in the role a week ago, but Facebook is yet to announce who will sit on the oversight board.

He was previously executive director at Article 19, a non-profit British human rights organisation.

Ahead of the announcement, Mr Hughes told journalists that the new role was a natural follow-on from his work at Article 19.

"The job aligns with what I've been doing over the last couple of decades which is promoting the rights of users and freedom of expression," he said.

Facebook, which will fund the board and its staff for at least six years, has also proposed a set of rules for the board to follow.

The "by-laws" will need to be approved by the board before they are set in stone.

Whether or not Facebook will grant the board any real "teeth" is up for debate.

"Hughes will lead the board's administrative staff. In the coming months, we will announce board members and trustees," Facebook said in a blog post.

"He [Hughes] will face enormous challenges making Facebook's oversight board credible," said Jim Killock, executive director of Open Rights Group, a non-profit organisation that aims to protect civil liberties.

"Facebook needs to grant the board powers to scrutinise the whole procedures within their content moderation process, not just adjudicate certain troubling decisions," he told the BBC.

"The Facebook oversight board is an important and long-overdue initiative, but it's also going to be very easy for it to be constrained and less effective than is necessary. Facebook, after all, mediates the speech of billions. Holding its decisions to account is a massive task."