What do they do to keep users from clicking away? I post a link on Facebook, you click it, the website opens. What do you mean? The opengraph tags? They are opt

What do they do to keep users from clicking away? I post a link on Facebook, you click it, the website opens. What do you mean? The opengraph tags? They are opt-in, the website puts it there voluntarily. Robots reading the pages? Robots from Google, FB, etc obey robots.txt directives (and if they didn't, it's the open web after all - reproducing the title of an article is fair use).