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From the article it would appear that their definition of a bot is a client with JavaScript disabled

• veyron 14y ago
  "So we did what any good developers would do. We built our own analytic software. Here's what we found: on about 80% of the clicks Facebook was charging us for, JavaScript wasn't on." Later: "So we did what any good developers would do. We built a page logger. Any time a page was loaded, we'd keep track of it. You know what we found? The 80% of clicks we were paying for were from bots. That's correct. Bots were loading pages and driving up our advertising costs" I think they use a different definition of bot. Otherwise they wouldn't have to use a second logger ...