Selena Gomez BANNED from Facebook

exclusive 0803_selena_gomez_main
Selena Gomez
has been banned from Facebook until further notice — but here”s the thing … it”s not the famous Selena Gomez … it”s a girl in New Mexico with the same name … and she”s PISSED.

18-year-old Selena MIRANDA Gomez tells our sources, she tried to sign in to her Facebook account on Wednesday … but was denied, receiving a message instead that her account had been disabled for being “inauthentic.”

According to the error message, the account was disabled for violating Facebook”s terms — which state, “Impersonating anyone or anything is not allowed.”

But clearly, the non-famous Selena isn”t impersonating anyone — and now she”s really upset that she”s been unfairly banned from her social networking profile, telling our sources, “I AM NOT AN IMPOSTOR … My name is not hers on my page. In fact, I even put my middle name on my FB to clear up any confusion.”

She says, “I did not have one single famous friend. I did not refer to myself as [the famous Selena], and I did not have any pictures of her on my page!”

Selena says she”s reached out to FB to reactivate her account — but so far, no luck.

A rep for FB had no comment.