When investing in consumer services, we try to be active users of the services.  That tends to provide a fair bit of insight about what is working and what is not (as long as one keeps in mind that one may not be the exact target user!).  To do something similar for our more developer directed investments, I have long been meaning to build a little project using MongoDB and Twilio.  But usually the extremely rare cycles that I have available for code go into fixing something on DailyLit.  Over Labor Day weekend, however, I had some unexpected extra time and used that to hack together a little experiment which you can check out at http://preditter.com (warning: very raw at the moment).  It was a terrific learning experience and I will post some follow ups with lessons learned.