Let's get specific here as "social media" can mean a lot of things...
The most useful social platform is probably FACEBOOK. Just create a FB page for your real estate business and start reaching out for friends and family to Like it. Then create posts about houses you list (with pic of house) or buyers that you helped (with pic of family), etc. and BOOST those posts. Boosting posts is inexpensive and a powerful way to get awareness in your personal network and beyond.
Also set yourself up a Google business listing (See Google My Business). Once "verified", this puts you on the Google Map. You also get a Google+ page - we post the same things to it as FB but of course no one uses Google+ =) But GOOGLE likes if you use it!
Also consider making videos and creating a YouTube channel for your REI business - here again, Google owns YouTube so they give you a lot of "SEO" credit if you use it.
If you're a listing agent, you might feature pics of houses on Instagram or Pinterest.
You might also create a BLOG and write about real estate and work on developing a following there.
Then there are the RE-specific social sites: BiggerPockets, Trulia, Zillow (you can create blogs and post articles and comments on those sites).
I've never found much use for Twitter, myself.
Point is, it's not hard - you're already doing social media here in BP! Just work a plan to develop a presence on those other sites. I would not spend $$ on someone to do this at a small scale.
Best of luck to you!
"Intelligence is the ability to adapt to change." ~ Stephen Hawking
