Facebook External Hit is a bot from Facebook. Every time a user links to a website on Facebook, Facebook will send its crawler to the given domain in order to check its details. The indexed results are only visible in relation to the post made on Facebook. As a webmaster, the Facebook External Hit is an indication of the number of times a website is mentioned on Facebook, which is an indication of the number of backlinks registered by Facebook.
The Internet of Bots has evaluated Facebookexternalhit against 50 different checkpoints, of which 38 have been confirmed as being positive. These checkpoints evaluate the transparency and occurrence of a bot and don´t necessarily say something about its quality. The BotRank is calculated as [38*2=] 76%. The details of the bot and the BotRank can be seen below. For more information on how the BotRank is made, you can visit the page Botrank.