Sr. Manager, Surgical Gloves Marketing at Cardinal Health
This is a great question. All of the social media pages you mentioned will help you with any professional job and additionally, any basic hard web skills you have building basic websites, managing a blog, creating memes or other content, can really help foster a common interest community on the internet, regardless of the industry or business model. Playing around with Wordpress,com, Weebly.com, or Square Space.com to learn the fundamentals of building and managing a few webpages, will allow you to feel comfortable managing a community in any field, including math and science. Knowing how to create event invitations online, use hashtags appropriately to mine topics on Twitter, Facebook, Instagram or other "trending" sites can help you connect to others in the STEM field, working on similar topics as you.
Learning how to leverage Q&A sites like Quora.com and Reddit,com can be helpful for any kind of professional, but especially in STEM fields where you might want to connect with other scientists or engineers working on similar research topics as you. It's a great way to create subcommunities based on common interests, and to do primary research with potential customers or subject matter experts. I hope this helps!