Someone i used to talk to made a fake myspace acct a year ago and now just added me on it.. what do i do?

my intuition tells me this. and i pretty much know for sure it is one
of two ppl who are friends with each other. or it is both of them
together 9which i actually think is unlikely but very much a
possibility).
anyway what do you think i should do? i think its funny, i got a laugh
out of it and i intend to tell this fake account that if i do add
them.