[Feedback] Product Managers - How do you represent yourself online? Do you have a portfolio?

I come from a design background where my online portfolio was an important tool to communicate my design process and highlight my skills. I've now moved into a Product Management role and I'm left wondering what to do with my portfolio.

I don't see many other PM's with online portfolio's and I'm curious why that is. Do they rely on paper resume's? Blogging? LinkedIn. Any product people out there that can provide some insight? I'm considering building something that makes it easier to get a PM portfolio online.