Tom Falco's Coconut Grove Grapevine community blog can be irritating. When he's writing about threatening to take photos of kids "posing" as school basketball players — only to watch them "scatter like rats" — or railing against a woman in a food truck poaching customers from Grove restaurants, Falco has all the perspective of a Picasso. But Merriam-Webster's definition of a gadfly is one who "stimulates or annoys, especially by persistent criticism," which might as well be the Grapevine's mission statement. There is no louder voice for a community — in his case, the Grove's business owners — in Miami.