Obama follows 645,000 people on Twitter and by contrast David Cameron follows 382 people, including Obama.
Instead of following @david_cameron, the Prime Minister's official personal account, 'Organizing For Action' which runs Obama's account has been watching the tweets of @davidcameron, who lives in Oregon and tweets about Star Trek, reports said.
Earlier this month Obama hailed Cameron, saying: "Put simply, David is a great friend and outstanding partner.
"He's one of my closest and most trusted partners in the world.On many of the most pressing challenges that we face, we see the world the same way."
But it seems that Obama's affection for his "bro" David Cameron does not extend to social media, the report said.