So, you've joined up to a new social media site. It's only natural that you want to gain followers. Let's face it, you likely joined that social media site so you can forge meaningful connections that will help you in the future to actual sell stuff.
Or did you?
This is where things get a little muddled, because there are many people who delude themselves about the truth of what they're doing—writers in particular.
Social media, regardless of the platform you are talking about, is all about building connections. It's about building those networks. The larger that network is, the better off you will be when it actually comes time to sell a book or whatever.
I'm not saying that you're going to blast "Buy my book" ads to your networks, because that is the LAST thing you should do. But, with fostered connections, when you do mention that you have a book coming out, those networks will help you to spread the word.
It might take years to build those valuable connections, but there is a right way and a wrong way to go about it.