Dating (or being very close personal friends) with Justin Bieber comes with a special set of liabilities, as teen sweetheart Selena Gomez has discovered during the past few days.

After photos surfaced of the pair getting cozy on a yacht in the Caribbean, Bieber's fans got nasty about Gomez on Twitter. In fact, they moved beyond nasty to downright vicious and threatening.

Some anti-Selena tweets have included:

@selenagomez I'll kill you I swear on GOD!!!!

@selenagomez whore cancer whore..like i'mm kill myself cuz i saw you and Justin kissing well thankyou Selena thankyou now i'm killing myself

@selenagomez stay away from Justin pedophile, retard wait i'm gonna kill ya in the night underneath your smelly bed

@selenagomez If you are the Girlfriend of Justin I will Kill you I HATE YOU :@ !!!

Former FBI agent and security expert Harold Copus of Copus Security Consultants in Atlanta says that even though these threats were sent over something as seemingly innocuous as Twitter, Bieber and Gomez should consult their security teams and take the threats with the appropriate dose of concern.