Facebook contest... Is this legal?

[Ryan Dossey]

Can I offer a referral bonus to my followers from my company for any properties that I close on? I am not a licensed Realtor. Which I know they can't pay a finders fee. However is there anything stopping me from running a like/share contest? 

Seems like it could be a great way to boost our following and even get some leads.

"We are offering a cash prize to anyone who brings us a home we close on. Like and Share to be eligible. If one of your friends call us and mentions your name get _______ cash!" 

Something to that affect. We normally post motivational quotes, deals we close on, and general updates. Looking to make it more involved.