Setting the scene
Technical glitches on Nasdaq's opening auction embarrassed bankers and fueled lawsuits from traders.
What happened
Mobile transition fears briefly crushed the stock until News Feed ads on phones printed money.
Why it still matters
Zuckerberg's letter to shareholders preached hacking culture over quarterly myopia. Memorable detail: the IPO came days after Instagram closed, timing synergy skeptics debated for years.
Background
The listing tested investor patience for user growth, Instagram acquisition math, and privacy scandals in the decade that followed.