Is it a person or just some sort of computerised spam?
DD has a musical.ly account. Tonight I noticed that someone had liked every single thing DD has posted and made some benign comments e,g. You're cool. I then spotted that this person had used a section of one of my Facebook photos as their profile picture. This photo is only available for my friends to see.
I am a bit spooked now. How has this happened? Any advice appreciated.