Two smartphone apps, Vivino and Delectable, are going head-to-head in competition for the wine geek market. Both use a photo of a wine bottle label — either taken through the app or imported from your photos — to identify the wine and enter the relevant information. You can also rate the wines.The apps incorporate some of the better features of social media, allowing you to follow others and to “like” or comment on their recommendations. Both apps allow cross-posting to Facebook and Twitter. If you see a wine in a store, you can look up reviews on either app.