If you are using major social media channels to carry out your business, the numbers are likely to vary on each platform. This is a phenomenon you cannot change even though the platforms are different in a way. That is why you need to find out a way of getting likes on all platforms. If you want to get many free likes without having to pay any penny, use your current customers that use these social media channels to reach you.
Just conduct a simple survey by asking the customers which platform they find kind and friendly in the course of your engagements. Allow them to give their views freely and ask them for possible recommendations to make the service better. From their opinions, you can easily find the platform to improve, to make better and to concentrate on for your business. With such inputs, the free likes will be overwhelming, and you will take advantage of the numbers. Consider all views received in the survey even if you feel they are not important. They are all opinions, and you got the last say.