Make the time to use social media. It's easy and free. Yes, there are some parts of social media sites that you may have to pay for, but for the most part you do not need them anyway. As a realtor there is no reason not to because everyone else is, especially millennials.
From what I can tell most agents out there are baby boomers, so they may be reluctant to get out there and learn something new for whatever reason. Trust me though. It's nothing like programming a VCR. The important sites like Instagram, Twitter, and Facebook require nothing more than setting up an account, building a profile, adding a photo, and then creating content. Consider content to be nothing more than a short blog.
Social media content is so important these days that when perusing the want ads you will notice that many employers look for people who have some kind of experience writing content. And unlike say a market data analysis type thing where you simply throw a bunch of numbers at the public, in this case you actually write short, informative notes that are created to get people's attention. And in most cases a picture or video is important to attach as well.
If you can put together a post card or website then you can do this. You can even link the three or however many you use together so that you only have to create the content once and then shoot it out to all the other sites automatically. Hootsuite is a fantastic and free application that allows you to do that. I have seen people pay $200 or more to set up this ridiculously easy site when you can do it yourself in minutes. Here is the bottom line though. In order to do this on your own you simply have to do the research and think things through. If you make a mistake it won't matter. You can't break the Internet or you computer and all mistakes can be fixed. My training consisted of nothing more than reading other expert's blogs and then applying it to my apps. Give it a try and once you get the hang of it stick with it everyday. It only takes seconds to send out a tweet.