I provide a “daily buzz” AI summary at the top of this site which gets updated every 12 hours and draws from 2 days of Posts.
The solution is proprietary and not in a public plugin however, but it demonstrates the concept.
And yes, it is prone to errors! 
I’ve been meaning to get it to link content … UPDATE: done, just needed GPT 4 Turbo and some prompt engineering. GPT 3.5 can’t cope with that level of direction.