"We are investigating the possibility that IS and other terror groups are setting up a social media platform," said Jan Op Gen Oorth, communications officer for the Europol policing agency.
"We are still working on identifying the full details of the account, including who has set it up and for what purpose," Oorth told AFP, but added that it showed likely links to IS and other extremists.
The investigation comes as Europe's policing agency struck out at online radical groups last week in a two-day operation.
"This coordinated hit against online terrorist propaganda focused mainly on the online production of terrorist materials by IS and Al-Qaeda affiliated media outlets," Europol said.
Among the items referred were propaganda videos and publications glorifying or supporting terrorism and extremism, it said.
Europol added that "efforts made by numerous online platforms to remove inappropriate content have driven supporters of terrorist groups to simultaneously use multiple platforms to promote terrorism and incite violence".
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