This conversation is all about the professionalism that's why we need to judge things according to professionalism.
If you are asking in terms of popularity, there are a total of 5 biggest social media platforms running the game currently: Facebook, Instagram, LinkedIn, Twitter, and YouTube.
Different social media is for different platforms. Like Facebook is for connecting your friends and family though it has other functions, Linkedin is to connect with professionals, Instagram is the best to know for image sharing platform, etc.
Facebook is the most common one. The pandemic made it more common as everyone is at homes with their mobiles in their hands.
Instagram is the most popular social network at the moment, but there are businesses that do not work from Instagram. Depending on what you do, you must find your place.