I built this on weekends during summer days last year. I haven't worked on this for quite a while, it's still unfinished, just a proof-of-concept prototype. Backend code is in Clojure, client-side code is in Coffee-script. Should I continue working on this?
URL: http://beta.holdership.com
Try it out freely! The site is in dev-mode, so it won't post anything to your Twitter.
UPDATE: I deleted the old post, because someone pointed out items he/she added didn't persist. I had a quick fix and posted again.