Selena posted a few hours ago a message on her Facebook about the influence the people around you have about yourself and about the fact that the consequences can be positive or negative. So this is like a warning to be careful with people with whom you walk. See below:
You're like those that surround you. Be aware of yourself. You can begin to believe and become those around you. ... Positively or negatively.
Is that Selena was just giving advice to their fans or sending an indirect to someone she knows?