Hello @solarsherpa! To answer your question about @null, this account is where your SBD goes to when you click the "promoted" button at the bottom of your post when it's open. You can promote at any amount you want and 2 things happen.
You get half of your spending added to the total of rewards on your post, AND you get listed in the promoted tab. Think about it like it's a special 6th tag you can get.
People use promoted to get their posts that they believe are good content more exposure and can bump a post up pretty high on a category list. I was using it last month but it can be fun, with good risk. Your post may not climb much higher, or people notice it and more people upvote it. Hope this info helped :D
Thank you for letting me know (and for reading the post all the way thru. I'm updating the post with that info.
Upvoted and (now) following.
Thank you! Bots can be very useful if you use them for good c: