When starting your online business, we would encourage you to look at as many social media platforms as possible (unless you already have an established business).
This includes the likes of Facebook, Twitter, Blogger, Instagram, LinkedIn, YouTube, etc.
The reason for this is because then starting out, you will not know where the majority of your success will come from.
Over time, you will learn where your results are coming from.
For example, you may realise that the majority of your leads and sales are coming from Facebook, therefore you may want to focus on that platform.
You will only realise this after focusing on each platform over a period of time.