Facebook and Crawl-delay in Robots.txt?

Question

Does Facebook\'s webcrawling bots respect the Crawl-delay: directive in robots.txt files?

Answer 1

if you are running on ubuntu server and you are using ufw firewall you may want to try

ufw limit proto tcp from 31.13.24.0/21 port 80 to any

for all of these IP addresses: 31.13.24.0/21 31.13.64.0/18 66.220.144.0/20 69.63.176.0/20 69.171.224.0/19 74.119.76.0/22 103.4.96.0/22 173.252.64.0/18 204.15.20.0/22

as shown here: What's the IP address range of Facebook's Open Graph crawler?