Collaborative boards dedicated to teaching abound on Pinterest. A few months ago, there were scores of them. Now there are hundreds of them. Some have 1000s of followers. Others are just getting started. If you teach kindergarten, you should check out these collaborative boards:
Kindergarten Math
Kindergarten Science and Social Studies/
Kindergarten Freebies
Kindergarten Holidays Crafts
Kindergarten Classroom Management
Math for Kindergarten
ELA Letters & Letter Sounds
ELA Sight Words & Word Families
ELA Letter/Word/Sentence and Syllables
ELA Punctuation and Grammar
ELA - Games
Kindergarten Teacher
Activities for Early Grades
100 is a Magic Number
Pre-K-K Teachers Pay Teachers
Keepin' with Kindergarten
Preschool/Kindergarten Science
Kindergarten Kreations
Kindergarten Kolleagues
Pre-K/K/1/2 Science Lessons And Activities
Lower Elementary Literacy
Lower Elementary Math
Lower Elementary Other
Lower Elementary Literacy
Early Literacy Activities and Ideas!
KindergartenKlub.com
Kindergarten materials under $3!
we teach: kindergarten
Primary grades wonderful picture books
free lessons
Learn to Read
Primary Reading and Math
Primary Materials from TPT
Kindergarten Lesson Plans
Kindergarten and First Classroom Ideas
Kindergarten and First Grade Common Core Standards
Kindergarten and First Grade Reading Resources
Kindergarten and First Grade Writing Resources
Kindergarten and First Grade Math
FREEBIES for Pre-K, Kindergarten and First Grade
Kindergarten and First Grade Spring Activities
KinderLand Collaborative
http://pinterest.com/misskinder/k-2-reading-writing-ideas/
Kindergarten Daily 5
*Primary* Must Have TpT Finds
KinderFun Collaborative
Pre-K and K Perfection
Kindercenter
This is certainly not a complete list. Is that even possible? Hopefully, you will find a few in this list that are new to you. If you have a favorite kindergarten collaborative board on Pinterest that isn't listed, please put the address in a comment. I'll happily add more to the list.