"We have been significantly restricting engagement with
tweets labelled under our Civic Integrity Policy due to the risk of
violence," the Twitter support team said. "This means these labelled
tweets will not be able to be replied to, retweeted, or liked."
Twitter and other social platforms were facing challenges
amid the unrest after President Donald Trump, a fervent Twitter user, had
rallied supporters in the capital city as Congress was set to certify the
November election won by Mr Joe Biden.
A Mr Trump video clip posted atop his official Twitter
account was tagged with a note saying the claim of voter fraud was disputed,
and that the tweet could not be replied to, retweeted, or liked "due to a
risk of violence."
Facebook said it pulled Mr Trump video from its social
network.
"This is an emergency situation and we are taking
appropriate emergency measures, including removing President Trump’s
video," Facebook vice-president of integrity Guy Rosen said in a tweet.
"We removed it because on balance we believe it
contributes to rather than diminishes the risk of ongoing violence."
YouTube has also removed a Mr Trump video that appeared to
be contributing to the mob violence by baselessly challenging the outcome of
the recent presidential election, which he lost, according to media reports.
However, a look at rival social network Parler showed posts
lauding the mob assault on the Capitol.
"Disappointing. Pelosi, Schiff, Nadler, Schumer, Romney
all got away. DC is a target rich environment," read a post at an
@Macholatte account. "Hope to see some of the DemonRat residences getting
torched."
An account from the militia group Proud Boys at Parler
posted a photo of a smiling man, apparently in the Capitol building, carrying a
podium.
Another Parler post hurled insults at Vice-President Mike
Pence, including calling him a "traitor" for refusing to overturn the
November election results.
Conservatives backing Mr Trump have expanded their online
platforms to include alternative social media sites which have refrained from
filtering unverified claims.