"Your personal brand is who you are. You must define it, tell your story and share your passions."

Precious personal branding tips by Brian Fanzo who makes a very interesting observation that giving and sharing come before receiving when it comes to online reputation - something that might sound counter-intuitive when you see some attempts at personal branding that mimic celebrities.
When I first heard the word personal brand, I have to admit I thought this meant behaving like a celebrity (playing hard to get, etc...). But celebrity has nothing to do with professional personal branding though: one is the results of events (eg: a movie), the other is the outcome of your communication throughout your career.
Professional personal branding is related to thought leadership (which you fundamentally can't show without sharing) and communicating your professional identity (which again is about sharing but also listening as Brian points out - communication goes both ways).
We're talking about something fundamentally human and relationship-based which these tips are a great help for.
cc @etnoamalia
How to brand you