Facebook: We managed to sign up every device-owning human in the world! Wall Street: So you’re saying growth will slow? After years of stock market (and Internet) dominance, the world’s biggest social network was due for a hit. But few expected the hit to be as dramatic as the one it’s currently taking. Slower growth and thinner margins were part of the problem. But the other part of the story is the steep price that Facebook says its willing to pay to harden its platform and address its scandals. From Fred Vogelstein in Wired: Facebook Just Learned The True Cost Of Fixing Its Problems. “The news also left little room for anyone doubting how serious Facebook is about restoring its reputation as a force for good. Founder and CEO Mark Zuckerberg has said that he has no intention of letting Facebook become a platform known for celebrating humanity’s worst impulses. It appears he plans to put more money than anyone expected behind that pledge.”

+ Tracking Facebook’s fortunes in six charts. (I just logged into Facebook and got one of those Facebook Memories. It was a snapshot of yesterday’s stock price.)