I've been working on Newsy for the past ~8 months.
Problem - I had lots of domains I've bought over the years which I never used!
Solution - I created a tool to automatically turn these un-used domains into a Reddit-like content aggregator. I wanted it to be fully automated with lots of content + social features (voting, members, newsletters).
It's been super fun creating it and also sharing with people who are also using it.
Some examples