There are many, many Facebook groups dedicated to the anti-Common Core movement. Here are the top three in the state, region, or school district (ranked by the number of members)...

Covering all of New York State:

• Stop Common Core in New York State
• NYS Refuse the Tests
• Opt Out of State Standardized Tests - New York

 Western New York:

• Western New Yorkers for Public Education
• Genesee Wyoming Parents for Quality Education
• Common Core Critics - Rural Niagara & Orleans Counties

Finger Lakes:

• Monroe County Against Common Core
• Stop Common Core in the Fingerlakes Cayuga, Onondaga, Seneca

CNY / Leatherstocking:

• Opt Out CNY
• Central & Northern NY for Education

Southern Tier:

• Southern Tier Parents Against Common Core
• Southern Tier Against Common Core

Adirondacks:

• Stop Common Core in the Adirondacks
• North Country Residents Concerned About Common Core

Capital Region:

• BH-BL and Capital Area

Hudson Valley:

• Hudson Valley Against Common Core
• Parents & Educators Against Common Core Upstate New York

New York City Area:

• Grassroots Education Movement: NYC
• Staten Island - Know Common Core

Long Island:

• Long Island Opt Out

 Special Interest, Covering all of New York State

• Stop Common Core in NY Catholic Schools
• NYS Special Needs Parents Against Common Core