Facebook's had a
rough day. In fact, it's had its worst day performance-wise in over four years, with 2.5 hours of downtime that resulted in countless complaints from users. Perhaps more important, it also had a bevy API problems, and its Like buttons ? which are embedded on over 350,000 sites across the web ? were apparently busted too. When Facebook goes down, it's a big deal. This evening Facebook Director of Software Engineering Robert Johnson has written a
post-mortem of the outage, explaining what caused the site to fail.
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