Why not just link directly to the profile or the photo? Why use a middleman?
The _rdr parameter was the traffic cop. It ensured that no matter where a link was shared—an email newsletter, a text message, a comment on a blog—Facebook intercepted the request first. It allowed them to: https://m.facebook.com/?_rdr
If you click https://m.facebook.com/?_rdr today, it usually just dumps you onto the Facebook login page or your news feed. It’s a "null" link. But in the hands of a sophisticated hacker, that _rdr can be appended with session tokens or malicious redirects. It is the digital equivalent of a stranger offering you a ride in a windowless van; sure, it’s a vehicle, but where is it actually going? Why not just link directly to the profile or the photo
After the 30‑minute preview ends, show a recap: “You missed 3 replies from a trending post in your area – log in to see them.” That creates gentle FOMO (fear of missing out) without being aggressive. It ensured that no matter where a link
Here are some of the key features you can expect to find on the mobile version of Facebook:
At first glance, it looks like a glitch. It’s short, abrupt, and lacks the usual mess of numbers and IDs that characterize most Facebook links. It feels like a backdoor, a secret handshake, or perhaps a mistake.