I have a saying that I coined for moments such as this. That saying is:
- Esperanto wasn't born yesterday™
Esperanto hasn't been sitting on a dusty shelf for 130 years. It's been in constant daily use this whole time. Sure, there are many wonderful things happening for Esperanto online, but they are tiny dots compared to the living history of this language.
Esperanto comes up a lot in my daily routine and occasionally people will say "Oh, isn't that in the movie by Shatner?" or "isn't that in Red Dwarf?" or "Didn't that die in the 70's?"...
... nobody has yet to respond to me "Hey, isn't that used in Wikipedia?" or "isn't that a course on Duolingo?"
There are entire books written on this subject. Bridge Of Words springs to mind as a recently written book, written in English, and available at most public libraries. You may want to start there.