Put that new iPhone 6 to good use and band together with fellow foodies in the "Yelp Has an App for That" promo. With this app, businesses extend offers to Yelpers to unlock, use and post comments using up to 140 characters. The main event is a fight of the apps among OTP restaurants offering special $5 appetizers from September 29 to October 3. The champion gets bragging rights for best appetizer. At Hearth Pizza Tavern, bite into chicken and mushroom spring rolls. Or, head over to Parma Tavern and sink your teeth into plump homemade meatball sliders. Both of these dishes are being offered up for $5 in this delicious duel.