Professor, you could've proved your point by linking to
at least one example of how Blekko found a founders
work and listed it by date (as the task required), instead
you have hashtags on health, finance, etc.
The truth is that nobody has arranged that information
in the way you want, if it existed at all, that venture
database where you found the 500 companies
would've been the natural place to look.. CrunchBase
maybe?!
Thought Worth mentioning