TWO - Twitter
Twitter is a social networking service to send and read short messages limited to 140 characters. Searching Twitter by hashtags is a great way to find resources shared by fellow educators from around the world.
THREE - TED
TED is a non-profit that started as a conference to bring people together from Technology, Entertainment, and Design. TED brings "thinks and doers, who are challenged to give the talk of their lives (in 18 minutes or less).
Ted-Ed contains over 300 original videos and lessons on a variety of topics. It also includes over 40,000 lesson flips of TED talks and other YouTube videos.
FOUR - Teaching Channel
Teaching Channel is an online service that delivers professional development videos for teachers. The site hosts videos that showcase inspiring teachers and a community for educators to share ideas and best practices. Sign up for a FREE account to download FREE lesson plans and student materials.