References requestable only via Facebook?

I’m probably behind on the material here, but I searched this forum and didn’t find anything on this topic. I used to be able to request a reference via email. Now I see only the option to connect to Facebook and then I assume I could request a reference only from folks I’m connected with on Facebook… Is that a new restriction? Or maybe there’s still a way to request a reference from someone, even if you’re not connected to them on Facebook?