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While it’s unclear if Omar Mateen---gunman accused of carrying out the deadly terrorist attack in an Orlando nightclub---had Facebook or Twitter accounts, he apparently had a MySpace page.
The MySpace page includes several photos of him, but it doesn’t offer much in terms of context, including his interests. He only has six people connected to him. The photos he posted on the page were being shared en masse on social media websites.
Several Facebook pages with the name “Omar Mateen” appear to have been set up after the terrorist attack.

MySpace