One can use the FB Messenger app without having to be a member of Facebook.
I find it useful when travelling to countries where I use my cell phone solely to connect to Wi-Fi. It certainly saves a lot of texting and phone charges.
I just typed in "SpringHill Suites Panama City Beach" in FB Messenger and, sure enough, one can send a message to them that way.
It might be time to download the FB Messenger app.
One can always delete the app once it has no further immediate utility.