Sheriff's spokeswoman Beth Utley says there's no indication the threats were connected to last week's school shooting in Connecticut.
There's no sign the postings are an actual threat but deputies were sent as a precaution. Utley says local police departments are also sending officers to schools.
Utley says regular and reserve deputies are at dozens of schools after students in Kirtland, Aztec and Bloomfield told administrators Friday they saw threats about guns on campus on Facebook.
Aztec and Bloomfield students reported postings of students with guns, while Kirtland students reported postings saying gang members would have guns at schools.