Do you have a side hustle? A passion project you do in addition to a day job? The kind of activity that, given a perfect set of circumstances you’d happily make your main vocation?  Is it on LinkedIn? Why not? Now, I admit, up until recently, my side hustle was not on LinkedIn either. In fact, when my current boss at the day job interviewed me two years ago this month, he actually brought up my author business. It was the first time anything like that had happened. It surprised me, but it also should have served as all the incentive I needed to update my LinkedIn profile. Yet I…