Social media marketing

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I’m a new agent, with just a few people in my sphere of influence that I have actual phone numbers or emails for so Facebook is my main source of contact. I was wondering if it was legal (or just looked tacky) to make a post on my personal page, tagging my business page and asking my Facebook friends for referrals for a prize, for example: share my business page or tag someone you know who may be looking for real estate and the person who sends me someone that creates an actual deal gets a $10 Starbucks gift card or something along those lines. I’ve never seen or heard of any agents I know doing that, so I didn’t know if it was allowed or if maybe it just looks like I’m begging for business?