Jeremy, What's a boosted post?

I just got an email from the Facebook advertising team.

I get these because I was admin for a Facebook page while I was involved in a (successful) Kickstarter-funded comics project. I could take myself off the admin list but to de-admin yourself (as with so many things about Facebook Pages) you have to do a emotionally awkward things. Let me say right away that the other admin won't mind me having access. I'm 100% trustworthy. I may be involved again in the future. I'm an extra pair of expert eyes. My options are:

1. Re-open contact with the other admin and negotiate my removal. Rejecting, awkward, and emotionally challenging for us both! 
2. Remove myself as an admin.  Rejecting, awkward, and emotionally challenging for me now, and for the other admin when she notices later -  and probably quite hurtful, too.

So, you see the difficulty. I'll stay as admin, and take the emails and the bugging to promote posts (which, like so many things, isn't working as well as it used to) and we'll all be fine, probably....

But to get back to the email. The subject line was Jeremy, What's a boosted post? FFS, Facebook Ad Team, if you don't know, then we're all in trouble. I'm hoping you know!

Also, stop pretending to be my apprentice.