I think CB is more focused on the finer details of a company for people to make business decisions.
How are you curating the database? I have been kicking around FinTECH Report http://www.fintechreport.info for a while now but curation is just such a de-motivator for me.
I was hoping that the respective owners/managers of a product might "take ownership" of the listings and manage them... I would love to hear how you solve for that.
P.S. I looked up Twitter and Biz Stone wasn't in the founder list. I'm sorry i'm not motivated to sign up and fix it. Honestly, i'm just not bothered to help out as a site visitor....but... I would hold it against the site if it missed such critical details as that. (Not trying to be harsh, just honest realistic feedback, if that's ok). :)
Good work though and interested to see where it goes.