Here are some more details from my report to FB: "My webserver is getting hit with bursts of hundreds of requests from Facebook's IP ranges. Google Analytics a

Here are some more details from my report to FB: "My webserver is getting hit with bursts of hundreds of requests from Facebook's IP ranges. Google Analytics also reports these hits and shows them as coming from (mostly) Philippines and Peru, however, IP lookup shows that these IPs belong to Facebook (TFBNET3). The number of these hits during a burst typically exceeds my normal traffic by 200%, putting a lot of stress at our infrastructure, putting our business at risk. This started happening after the Facebook Support team resolved a problem I reported earlier regarding connecting my Facebook Pixel as a data source to my Catalog. It seems Facebook is sending a bot to fetch information from the page, but does so very aggressively and apparently call other trackers on the page (such as Google Analytics)" 69.171.240.19 - - [13/Aug/2018:11:09:52 +0200] "GET /items/ley3xk/ford-dohc-20-sierra-mondeo-scorpio-luk-set.html HTTP/1.1" 200 15181 "https://www.facebook.com/" https://www.facebook.com/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134" "e.g. IP addresses 173.252.87.* performed 15,211 hits between Aug 14 12:00 and 12:59, followed by 13,946 hits from 31.13.115.*" "What is also interesting is that the user agents are very diverse. I would expect a Facebook crawler to identify itself with a unique User-Agent header (as suggested by the documentation page mentioned earlier), but instead I see User-Agent strings that belong to many different browsers. E.g. this file contains 53,240 hits from Facebook's IP addresses with User-Agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134" There are a few Facebook useragents in there, but far less than browser useragents: 7,310 hits: facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php http://www.facebook.com/externalhit_uatext.php) 2,869 hits: facebookexternalhit/1.1 1,439 hits: facebookcatalog/1.0 120 hits: facebookexternalua Surprisingly, there is even a useragent string that mentions Bing: 6,280 hits: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534+ (KHTML, like Gecko) BingPreview/1.0b These IPs don't only fetch the HTML page, but load all the page's resources (images, css, ..) including all third-party trackers (such as Google Analytics). Not only does this put unnecessary stress at our infrastructure, it drives up the usage costs of 3rd party tracking services and renders some of our reports unreliable." final response from FB: "Thanks for your patience while our team looked into this. They've added measures to reduce the amount of crawler calls made. Further optimizations are being worked on as well, but for now, this issue should be resolved." <- NOT.