How many social media do you use? What's your favorite among them and why?

The use of social media has become essential for marketing and branding your business, as well as building an audience. I see many hunters here managing multiple social media channels and some utilize them effectively to promote their products. I was just wondering.. 1. How many social media do you use on a daily basis? 2. If you had to choose one, which one would you choose and why? 3. What is the main purpose of your social media accounts? Happy weekend!