"Oh boy now nothing works," says one angry post. "Is this the beginning of the end for Facebook?"

"You've killed this platform," says another.

Together with some abuse for Cambridge Analytica, there is also anger pointed at Facebook's senior managers. They're being blamed for not keeping up their guard.

Read more about Facebook's privacy crisis:

• WhatsApp boss and co-founder Jan Koum to quit
• Facebook 'downvote' button in new test
• Facebook to vet UK political ads for 2019 vote
• Reality Check: Was Facebook data's value 'literally nothing'?

I experience a much calmer view though when I visit Ben Parr's office in San Francisco. His start-up Octane AI helps retailers reach customers through Facebook Messenger.

When I ask him for one word to sum up the mood among developers, he chooses "anxious".

"These kind of changes that Facebook definitely had to make after everything that happened has an impact on everyone," he tells me.

"You can't acquire new customers if the platform is paused."