I just launched https://explainmyproduct.com earlier this afternoon, and I'm already getting people listing their sites and providing feedback to other site owners!
That said, I am realizing that there is a certain percentage of people that need reminders to provide quality feedback--the type of feedback they'd like to receive from the community. The success of this product relies on people giving and receiving quality feedback, so I realized early on that I need to remind people that this is not a one-way transaction.
I added a "confirmation" and reminder note to give people a second to make sure they feel good about the feedback they are providing to others.
At any rate, I'm excited that people are already using this--I literally bought the domain on Friday and build the product yesterday!