Ask HN: Why isn't there a Dribbble for Product Managers and Sales type roles?

There's Dribbble for designers and Github for developers, but why isn't there a marketplace to discover/share/follow talent that's similar in scope to these services, but catered to PM's and Sales folks.

As a designer, you are constantly curating your Dribbble portfolio, posting updates, sharing success and following others. Same thing for GitHub. As a Project Manager and Sales guy, I would love the opportunity to follow others in the same role, while also tracking my own metrics (number of projects, number of deals closed, etcetera).