A mental disorder is spreading among Facebook users. It's FOMO and it's giving some people a very bad attitude. FOMO stands for the "Fear of Missing Out".

Social media expert Mailynne Calvin explains it this way, "Fear of Missing Out is related to social media, it's looking at what other people are doing and feeling like you want what they have."

A good example are those photos that show up over the summer of your friends' toes in the sand. You might think, 'I wish I could take a vacation instead of sitting behind this desk'. Or, Calvin explains, it could mean seeing a friend posting photos of their successful children graduating with honors, getting an athletic scholarship, having a baby, moving into a new house or taking an exciting job. 

"When people are posting online, they're posting positive things about their life," Calvin said. "Usually through pictures." 

Calvin said the story behind those photographs might reveal a not­so­perfect family, but because of social media, we only see the good stuf

"It's natural to feel like you want that, but there's all kinds of stuff that goes on behind the scenes in peoples' lives that you wouldn't share publicly. 

Another side of FOMO is the fear of missing out on the constant conversation among friends on Facebook. If you don't check your timeline every 30 minutes you may miss something that everyone else is talking about you have a bad case of FOMO. 

Here's the link if you would like to read the psychological study on FOMO. http://www.explorejournal.com/article/S1550­8307(13)00347­9/abstract