I'm not sure if I can remember all questions but if it comes to the witnesses I'm sure I received an upvote even if I don't know who most witnesses are. I mean my account didn't start yesterday and a few are active so my answer is yes.
I lie if I say how or what with SP and the rest of those "letters". I'm not the most active and simply forget about Steemit if work and interests take over. I'm not sure if I have an amount in mind since Steemit is not what I focus on. I try to answer and vote in the past and now. There was a while I gave up on it due to lack of response. I delegated cause lack of time so not much left to give. So my vote is more a sign like 'I was here's.