The massive proliferation and spamming of facebook social plugins across seemingly every web page on the internet over the last few years, allowing them to track user's every move across the web. Also refers to the shameless promotion by more and more people and companies on and offline trying to suggest that you must join the swarm and get on facebook. This is the crowd of people bitching at you more every year for not having a facebook.
Both phenomena are reminiscent of the swarm of zerglings flooding into your base that constitutes the standard zerg rush
in the game of Starcraft.
ex 1: What the hell? why do I need a facebook account to log in everywhere now? Goddam Zuckerberg Zerg Rush.
Croud of sheeple: "OMG U NEED A FACEBOOOK, LIKE RIGHT NOW!! HOW DO U LIVE WITHOUT ONE?!!1!"
Me: "What is this, the Zuckerberg Zerg Rush? Get his cock out of your mouths already and leave me alone."