I use Facebook daily. It is probably the most common form of social media that I use. It is not only a great way to keep up with friends and family but I find it useful in learning about things I can use within my classroom from other educators. I find that many of my teaching peers use Facebook to share about all things educational. Here are a few Facebook pages (many can be found on other forms of social media as well) that I follow that connect directly with my career as a teacher and coach...
Teachers Pay Teachers
Michele Luck's Social Studies - tptsocialstudies.com
Iowa Board of Educational Examiners
Professional Educators of Iowa
History (@HISTORY)
Teacher's Discovery (@TeachersDiscoverySocial)
Kristopher "Kritter' Hayes