Edutopia: Do you need a digital teaching portfolio?

Do you have a digital teaching portfolio? A recent Edutopia blog post talks about the benefits of having one:
"There are several reasons to start building a portfolio:
- You’re looking for a new job. A media-rich teaching portfolio will give employers a deeper insight into your teaching practices while signaling that you're a 21st century teacher. Having a teaching portfolio can be a decisive element at the interview stage of the hiring process (Mosely, 2005).