Well this is interesting. I hadn't heard of Beeper before. Many years ago I used Trillion (I think it was) as a chat aggregator. It fell apart pretty quickly, but Beeper looks promising. I signed up for their wait-list. We'll see what happens.
They have thousands of signs including locations in other countries. I'm not sure what the current count is, but 10 years ago there were 100 Wall Drug signs between Rapid City and Wall (about an hour drive on I-90).
The original author of this comic would post his content regularly on Reddit. I refuse to download the official app to verify I'm right about his name, but I believe it was sellyourcomputer or something like that. I'll edit this if someone corrects me.
I'm also a RIF refugee. Liftoff is the first app I've tried for Lemmy. Overall I'm pretty happy. The updates get better and better. I'm still leaning how to Lemmy, but I really like it so far. One of the few things throwing me off at the moment is that I either can't or don't know how to easily tell what posts I've already seen. RIF would change the color of the text from white to blue. If they can add that then I'll have nothing to complain about.