According to Yelp Boston, Teele Square and Winthrop are part of Boston, but Dorchester, Roslindale, and Mattapan aren't (oddly, Yelp does list Hyde Park and Dudley Square; you'd think there be dragons between Hyde Park and Brookline; giant sea creatures between Dudley and Mission Hill).
Over in Dorchester, Chris and Erin aren't taking this hipster snub lying down: They've started a campaign to get the user-rating service to add Dot, especially since it has far more restaurants and shops than many of the other included areas:
... This omission seems almost purposeful. ...We are asking our readers to take a moment and send a comment to Yelp! that Dorchester needs to be added to their list of Boston neighborhoods. This simple action will encourage more people in the city to visit Dot (because Yelp! is such a widely used website by people under 40), having a positive effect on our local businesses. ...