First detect the businesses mentioned in the chat and get some metrics.

Also, can you provided a "similar businesses" "customers also bought" and "sponsored results" sections for sponsors? Also, somehow allow sponsors to offer coupons like on the back of shopping dockets.

Maybe turn it into a magazine site somehow.

Go to a local newspaper or newsletter and they may provide free content (or pay you to get theirs out)? Sell the app to them?