The Sri Lankan government has lifted a ban on social media that came into effect after the Easter Sunday bombings.
The president's office confirmed on Tuesday that all social media sites can be accessed in the island nation, but urged the public to refrain from spreading rumours.
Meanwhile, security in Sri Lanka has been ramped up after intelligence reports showed that IS militants were planning fresh attacks before the start of the holy Islamic month of Ramadan.
In a letter to the lawmakers, the head of the police ministerial security division said the attacks were expected on Sunday or Monday by militants dressed in army uniform.
"Security will stay tight for several days because military and police are still tracking down suspects," a senior police intelligence official said.

Trump cancels US strikes on Iran, citing progress in talks
US confirms third strike on Indian-crewed tankers this week
UK defence minister Healey quits, says PM Starmer's plans fail to keep country safe
False alarm at the Pentagon triggers brief shelter-in-place order
Trump says US will hit Iran 'very hard', take control of energy infrastructure
US and Iran trade attacks for a second day, undermining shaky ceasefire
Bahrain says debris from intercepted Iranian drones injures child, damages homes
Philippines launches probe into deaths of two athletes from top basketball team
