Online communities of mathematics educators

Communities on General-Purpose Services

Twitter

Main article: Mathematics educators on Twitter

Communities on Specialized Services

AP Teacher Community

https://apcommunity.collegeboard.org/

Curriculum-Specific Communities

http://www.cpm.org/phpBB2/

Global Math Department

http://globalmathdepartment.org/

The Math Forum

http://mathforum.org/

Math Education Reddit

https://www.reddit.com/r/matheducation

Mathematics Educators Stack Exchange

http://matheducators.stackexchange.com/

The Mathematics Teaching Community

https://mathematicsteachingcommunity.math.uga.edu/