I think you answered your questions yourself. People should get comfortable and welcome downvotes as they do upvotes. Realtime feedback would make the system work as it was designed.

I am not sure if I would enjoy several bits of posts at various times of the day. That's just me, I don't keep up with fb twitter etc for similar reason.

However, when you put them all together in one post like this, it is pretty cool. I think you could combine them all at the end of the day and make it a daily activity report :) Since they are all posted elsewhere, it shouldn't take too much time. Or maybe automate :) Just make sure cheetah doesn't catch you for copy paste lol.

In conclusion, you should do whatever feels natural to you. So should everybody else. After all, this platform will have to be able to handle masses and their social media habits that they already have developed elsewhere.