Many journalists nowadays have a twitter account because of their work, and news websites syndicate from their personal accounts.
And I think the extent of this is a whole big can of worms I'm not sure I'm in a great position to address as a researcher at a university with surprising levels of freedom to shoot my mouth off and not care what anyone else thinks.
While I personally know plenty of people in evangelist roles and while I consider them friends, I can't say I'm qualified to really talk about where a line should be wrt separating their personal and professional speech. I hope someone who is qualified to discuss it approaches this point, because I think it is worth discussing and increasingly important.
tl;dr: I really hope this discussion continues but I'm probably not the right person to talk about it down this particular wormhole.
Some things are different in because of it - but honestly if you care about your public image, you shouldn't share 'private ' jokes on a very public medium.
I'm not sure I agree with you, but I think this is an interesting point in the debate and wanted to acknowledge that even though I don't have a snappy response for you at the present time. Hopefully other people engage this point. It seems worth talking about.