It's unbelievable how dependent I was on cruising Twitter to stay up-to-date. Now, it's unusable. I've been trying to use BlueSky and Mastodon as a drop-in replacement, but it's been difficult (or I've just lost the time to keep up). Aggregate newsletters have been the best option for me thus far.

I'd be quite interested in the documented process of how you set all of this up, but if you're offering a paid service, I'd understand if you'd rather leave it as an exercise to the user.