I think we are all compound people - we have a multiple aspects or perspectives in our lives depending on whether we're at work, at home as kid/parent/spouse, or at church or the local biking club. That's not an exception, that's the normal way we do things. We exhibit it with our dress (business suit / casual wear / community clothes) and our talk. When we suppress this idea in the online world, and pretend that we're always professional, or always all about this passion or that one, we are attempting to manipulate people's impressions of us. Especially if under another online identity, we are making those personal comments or sharing instragrams that are 'unprofessional' in nature. (I don't mean questionable here, I mean not work-related) It is not genuine, and hence begs questions around trust in what's being said - because it's not the whole story.
I support the concept of being one person, and have the people that choose to listen to you understand that there are multiple interests and important aspects in your life. I put forth that the same is true for each member of your audience, and hence legitimacy is granted. Your listeners, viewers or audience may not like your entire interests - but that's the beauty of choice. They can elect to un-listen in the various forms that takes. For those I listen to, I'm not as interested when they post a picture of their dog, as when they talk about the things that I care about - BUT - and here's the important bit, I know that they aren't hiding anything, and are genuine as otherwise they wouldn't have the guts to say it all.
There's a side-note here worth saying. You don't have to post it all, and I'm not suggesting that you do share everything in your life. If you only want to blog about work topics, or only talk to old friends on FB, that's fine. Each of us adopts the personality for our circumstances as we require. Just be straight about it, as we're all compound people.