Ever noticed that when you share a link from Facebook on your phone, the URL sometimes ends with (or &_rdr )?
It stands for "Redirect" – specifically, a server instruction that tells Facebook, "Hey, this user just landed on the mobile site. Check if they need to be sent to the app, the desktop site, or a different page." https m facebook com _rdr
That " _rdr " Thing in Your Facebook Mobile Link? Here’s What It Means. Ever noticed that when you share a link