Why do I have a feeling you were just phished. What link were you following from facebook. If it wasn't in the official Jagex channel I would be scanning my computer for malware and changing my password immediately.~Tranq~
Reaping another soul from the ambient mortality
Sounds exactly like a phishing attempt. Did it ask for your PIN and authentication as well?
The safest way to check is to find a device you don't care about or input important information in that isn't acossiated with you in any way (In case of keyloggers or other malware) and input random fake information and see if you still get in, though from what you said it's pretty much confirmed a phishing link. Change your passwords/pins and check for viruses immediately.
I made a video game, check it out!
https://discord.gg/KswK8wa https://onelastlight.weebly.***/ http://onelastlight***************/ https://onelastlight-onelastlightwiki.pbworks.***/w/page/134447487/FrontPage