Here are some hyperlocal hashtags that no one is using here as yet:
#CRLS, which is Cambridge Rindge and Latin School, the one public high school in the city where we need more tutors
#ks2 aka
#kendallsq
#harvardsquare
#InmanSquare (being used here unabbreviated but otherwise #InmanSquare
#davissquare
#eastcambridge
#weha which stands for Wellington-Harrington neighborhood (OK, it's hardly ever been used on the birdsite, but ...)
#CambPS
#Cambridgema