Been using my "Trademark" since 2001 and a ex friend stole it and made a website with my name under .org mine is .com. d

[Yeti]

It's a little hard to say without seeing the actual thing. This would mainly be a legal issue if you had a full-blown business running with a fairly unique name, and they started doing something that would confuse consumers about the source of goods or services. If these are just things like Twitter and Instagram accounts, you're generally not going to be suing over people using similar or identical names. If the person is really truly damaging somehow, you can look into suing them. But it's doubtful that what they're doing is costing you thousands of dollars, to make it worthwhile to look into.