United States President Donald Trump denounced the world’s top social media companies for “terrible bias” and accused them without evidence of manipulating his content during a summit at the White House on Thursday.

“You have a lot of power and you have to use it wisely,” President Trump said to the several hundred conservative digital and social media professionals in attendance, before celebrating their work extensively.

“You communicate with our citizens without going through the fake news filter,” the tweeter-in-chief said. “The crap you think of is unbelievable.”

The president spoke to the “historic” nature of the gathering, taking repeated shots at the mainstream press and praising the people in the room who challenge “the media gatekeepers.”

Trump invited conservative activists who have been curbed or banned on social media to press his argument that big social networks are discriminating against conservatives, notwithstanding his large online following.