United Kingdom, May 11 -- Joseph Fiennes thinks social media has made being a parent "impossible".

The Dear England actor - who has two daughters, aged 16 and 14, with wife Maria Dolores Fieguez - takes strict control of his girls' phones but admitted it isn't an easy job helping them to navigate the online world when up against the resources of tech companies.

Noting his kids are on social media only when he "allows them to be", he told the Guardian newspaper he would now include parent as the toughest job alongside his previous quip that prime minister and England soccer coach are the most difficult.

He explained: "It is impossible. We are up against the f****** nightmare of tech companies and devices and the disruption of brain chem...