Facebook Sneak 

a user on Facebook who repeatedly activates or de-activates their personal profile and/or blocks and unblocks the profiles of various people in order to accomplish one or both of the following:

a. sneak in and out of another person's account to see what they are up to and with whom without them knowing they've been there;
b. prevent certain people from knowing where and with whom they were sneaking around with.

I wish Paul would stop being a Facebook Sneak! He blocks and unblocks me before I can unfriend him in my profile settings!

Facebook Sneak by Paranoid in Panama July 19, 2011

Facebook SneakMouse 

People who are always on Facebook but never "do" anything on it. They are too cool to add any updates, photos, links, or comments, or make any other contributions, but somehow they know everything everyone else is doing.

You meet up with a Facebook SneakMouse and over the course of your time together (coffee) they will reference several Facebook posts, photos they saw, or links. You're thinking, 'but hey, you're never on Facebook'....

Ah-HA! They totally are, but are just too cool to admit it.

On top of that, 'catching-up' over coffee is a one-way conversation because the Facebook SneakMouse already know everything you've been up to through...you guessed it...Facebook.

Facebook SneakMouse by bunnydrops July 31, 2010

facebook snake

A person who only adds you on facebook,to spy on your life.
This person also likes every status and picture you post.They never talk to you in general,only when it benefits them.

That persons a facebook snake,spying on me,but never speaks.Unless it suits them.

facebook snake by snakecatcher14 December 21, 2014