Just read a more interesting blog post than this will be.  I recommend you check it out.  Posting here for my reference.

https://staltz.com/an-off-grid-social-network.html

Here's a link directly to the project: https://www.scuttlebutt.nz

I've often thought about this, but there's a huge difference between thinking and doing.  I'm glad there are doers out there!