if you and your friend have the app you can send each other $1 drinks
so it lets you search the area for bars you select the one you at, they have a list of the drinks that qualify, select one, select who you sending it to, they receive a text in like 5 secs
once they hit redeem you have 5 mins to go to the bar and request ur drink.
Was out with a couple friends yesterday we did it, then I guess the bartender was cool so he would give us 2 for 1 redemption etc.
It was the first I'd heard of it I was at a kickball league meet n greet.