"Big Brother" Shelly -- Family Meets With FBI Over Death Threats

The family of "Big Brother" contestant Shelly Moore has met with the FBI to discuss the onslaught of death threats that were made to them after Shelly voted to evict a popular house guest last week.

TMZ has learned ... the meeting took place in Louisiana this week -- but after the agents reviewed the information, sources tell us the feds determined that none of the threats were "credible."

We broke the story -- a bunch of deranged fans bombarded the Moore home with frightening phone calls and emails after Shelly voted to evict Jeff Schroeder ... a fan favorite.

Sources close to the family tell us ... the threatening phone calls and emails have essentially stopped in the past couple of days -- so they're not too worried anymore.