Twitter has been steadily ramping up its ad efforts this year, first bringing promoted tweets to mobile devices and more recently opening up ad buying to all US users. Now, according to Ad Age, the social network is preparing to introduce promoted tweets based on your location. In addition to displaying nearby retailers, this feature could showcase deals and promotions at stores in your area. Twitter already display's different advertisers' tweets based on general metro areas, but drilling down into specific geo-coordinates will naturally deliver more relevant adverts. Facebook, meanwhile, has been serving up content based on a user's ZIP code since 2011; so a little catch-up is definitely in order. Twitter's targeted ads will supposedly launch at the end of the year, just in time for that all-important retail rush.