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Someone from Facebook explained what happened though: https://news.ycombinator.com/item?id=10386811 https://news.ycombinator.com/item?id=10386811

• alecco 11y ago
  Sounds like a made up excuse.
  • cwyers 11y ago
    Really? Facebook likely is a huge target for spam, and it's not unreasonable to think there would be false positives in an effective spam killer at scale.
  • ampersandy 11y ago
    I used to work on the Site Integrity team at Facebook. It's really challenging to fight spam at scale. We've accidentally blocked many top domains in the past -- mistakes happen and we work to fix them as quickly as we can.