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When you log on to Facebook just long enough to check what's up, then you log off real fast so no one can catch you and talk to you. You're trying to avoid getting yelled at or asked for a favor.
I checked my Facebook for 3 seconds and logged out before my mom saw me online.
He logged on, saw it was his ex, and logged off before she could send a message.
She checked her feed, saw her crush was online, and logged out before he could message her.