A fairly obvious place to start would be the Google Apps for Education group:
https://plus.google.com/communities/101802680117484972712
This is a great community that shows the powerful tools Google Apps has, including Google+, and how it can be used in a classroom setting. It's great for those new to the Google platform.
STEM Educators:
https://plus.google.com/communities/112904336188381403474This group provides support and tips for STEM teachers, as well as provides information on how to use general technology in classrooms.
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