Yes, I used to be a regular on some of the maths challenges and puzzle groups on FB. I used to contribute questions too - then work got in the way! I think those folks would love to come to Steemit, engage their passion and get paid for it!

There is the Mathematics forum on chainBB so they can hang out there. I was going to start posting on FB again just to attract users to Steemit, but if you are still engaged with those communities then ask them over! There are no affiliate or referral links - just the growth in the community and the total community votes.