ONE recent rainy night, I curled up on my couch with popcorn and Netflix Instant, ready to spend a quiet night at home. The peace was sweet — while it lasted. Soon, my iPhone began flashing with notifications from a handful of social networking sites, each a beacon of information about what my friends were doing.

As the alerts came in, my mind began to race. Three friends, I learned, had arrived at a music venue near my apartment. But why? What was happening there? Then I saw pictures of other friends enjoying fancy milkshakes at a trendy restaurant. Suddenly, my simple domestic pleasures paled in comparison with the things I could be doing.

The flurry of possibilities set off a rush of restlessness and indecision. I was torn between nesting in my cozy roost or rallying for an impromptu rendezvous, and I just didn’t know what to do.

My problem is emblematic of the digital era. It’s known as FOMO, or “fear of missing out,” and refers to the blend of anxiety, inadequacy and irritation that can flare up while skimming social media like Facebook, Twitter, Foursquare and Instagram. Billions of Twitter messages, status updates and photographs provide thrilling glimpses of the daily lives and activities of friends, “frenemies,” co-workers and peers.