One of our portfolio companies that is now coming out of stealth mode is Me.dium. They just launched a closed beta but let me know if you want to try it out and I can send you an invite.
The company is in Boulder. It's an amazing team and we are excited to be working with them. They decided to share some of their plans to the local DailyCamera.
I agree with Brad. It's a lot of fun. I've turned on "visible to all" as well.
Update: here's another article on Me.dium. This one is from GigaOm. Much more detail.