The NCBL and a number of teams are on Twitter as well, see below :

NCBL - ncbl
Diamondbacks - OttawaDbacks
Dukes - dukesbaseball
Brewers - nepeanbrewers
Ponies - KingstonPonies
Braumeisters - braumeisters
Sweat Sox - SweatSox
Bombers - Bytownbombers
Mavericks - orleansmavs
Athletics - ottawaathletics
Black Sox - OttawaBlackSox
Coyotes - NCBLCoyotes
MVP Royals - MVPRoyals
Cyclones - cyclonesaylmer
Chiefs - BarrhavenChiefs
Panthers - PMA_Panthers