I have a sysadmin job by day for my main income. But I am also a craftsman and artist in my free time. I occupy a niche within a niche and I am pretty successful and recognized as a skilled person who makes nice things.
None of that would be possible without social media to share pictures of my work, or having customers contact me. More than half my orders come from people contacting me via my fb page. The rest via a forum on which I am very active, and a handful through my website. So I'd say 90% at least via social media.
If it weren't for social media, I would simply not be able to do what I love. 75% of my customers live in the US and I live in Europe. I think I've only had 2 customers ever in my own country. So noone would buy my things which in turn means I would not have the funds to buy the materials I like to work with or the tools and machines I use. At best I would have to go to every single crafts fair in a 300 mile radius and make / sell 'low cost' (less than 300$) generic things that appeal to most people instead of making the things I love using the materials that I love.
Sure, social media can be a huge timesink and distraction if you let it. It can also be the vital enabler for your ideas or business.