He stole my online profile (including photo) and set up an account with the same first and last name, changing only one letter.

He's been friending my friend's list and marketing time shares to them.

I didn't want to make too big of a deal about it, but I did want my friends to understand it wasn't me. So I welcomed him aboard on my timeline and jokingly admonished him to not market timeshares to 'our' friends.

Should I be more worried?