Salesforce purchased heroku in Dec 2010. This was before, for instance, ruby creator Matz was an employee (he no longer is). Heroku had only existed for about 2 years when salesforce bought it. I think there are some other features we think of as core to heroku that actually weren't deployed until after the salesforce purchase.
I think a lot of people remember it this way, but I think they are wrong and heroku's golden age actually came a couple years after the salesforce acquisition.
