How could this be weaponised against someone you don't like? How easy is it to set up a <any social network> account under someone else's name, post a bunch of

How could this be weaponised against someone you don't like? How easy is it to set up a <any social network> account under someone else's name, post a bunch of inflammatory opinions, AI some photos of them at a Free Palestine rally, and then sit back and await the inevitable border crossing horror story? Mental note: Research yourself (and your traveling companions) thoroughly before visiting the US.