Here is the collection of some Erasmus+ Facebook groups to find partners and participants

EU Projects partners & participants
International Youth Leaders Group
Youth Opportunities
Erasmus Training & Scholarship & Youth Exchanges
Projects Partner Search
Gençlik Projeleri Kulübü
Not only YiA
Erasmus+ Partner Search
Erasmus+ Türkiye
Erasmus+ Partner Search
Erasmus+
KA1 Ka2 Ka3 Exchanges Network
Do Great Things Network & Friends All Over the World

Erasmus+ Bilgi HAvuzu/Türkiye
Youth Partner Network
EU Erasmus+ Projects
Otlas Salto Youth
Erasmus+ Projects