We asked people about problems or inefficiencies in their industry that could be solved by Saas products and then sent those ideas out as a daily newsletter. I learned a lot, but had difficulty making money with it. Also, I'm not totally sure my heart was in it. I think about it a lot.
I've recently launched a new project - https://topstonks.com where I'm exploring this new speculative culture of investing emanating from places like reddit's Wallstreetbets, and 4chan's Biz.
We currently look at the most mentioned equities and send out a list of those. Once or twice a week we'll post an analysis with some comments from those communities (heads up, if you're easily offended, the language can be a bit crude.)
There are bigger plans on the roadmap, but we're just starting w/ the newsletter for now.