Or bartender, or barista, or mechanic, or librarian, or shop assistant, or beautician or God knows who else you might want to thank. The point is, some of the people in the service industry are just so amazing that a 'thank you' and a tip just don't feel like enough. And I mean, how many times in a row can you actually say 'thank you' to your waiter on a single visit for it not to seem odd?
A while back someone complimented me on my blog (thank you!), I followed the link back to his, then via his twitter I discovered an interesting app, then later I realized he was involved in the making of this app... To make a long story short, it's the ultimate thankful app!
You get great service somewhere, you open We&Co, you press "thank". The server can thank you back or even offer a freebie... Or maybe you can even help your server get a raise if he/she becomes one of the most thanked! A way to promote a business by putting the emphasis on its people.
P.S. Just remembered how my funny grandma once jokingly said to my mom - "you can have your 'thank you' for lunch". If she was tech savvy enough, maybe she'd enjoy using the app to add a little extra to her 'thanks', ha!