Also I would guess the "local farm" bit is showing that they are supporting tiny/small businesses which is exactly their target market for sellers.
2. There are just amazing number of places to compost in brooklyn.
The local farm bit is just there to make them feel better about themselves. That is, again, hipster.
A non-hipster would just be doing it, without making it seem like it's amazing and that they are doing it in some beautiful unique snowflake way.
That being said, for the latter point, I haven't tried very hard to find one.
http://www.nydailynews.com/new-york/brooklyn/city-pilot-comp...
http://www.nytimes.com/2014/05/31/nyregion/composting-in-new...
etc It's been expanding gradually.
As for not knowing a single place, seriously, you aren't looking very hard, since "compost pile brooklyn" shows about 50 easy places
Also I would guess the "local farm" bit is showing that they are supporting tiny/small businesses which is exactly their target market for sellers.