timestamp	ip	host	browser	uri
20181017-19:31:51	69.171.251.23	69.171.251.23	facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)	/robots.txt
20200409-01:27:49	69.171.251.23	fwdproxy-ash-023.fbsv.net	facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)	/robots.txt