Right lets look at the numbers, these are the figures for Q4 of 2019 measured by monthly active users worldwide:
Facebook 2,237,091,734 (more than double its nearest competitor)
Interesting right..especially as you may not even be aware of Qzone and Weibo, which are Chinese social media platforms.
So clearly you should be on Facebook and Instagram and not even bother with Pinterest or LinkedIn right? Well not really, although this shows the most popular channels, you should also be considering which social media channels your target audience are using.