Plus 1 keeps track of good deeds and the Twitter people who appreciate them. Every time one person thanks another on Twitter, we notice. ï¿½+1ï¿½ is how we say thank you. Add Twitter voting to your application in five minutes or less via RESTful API. The API includes methods to retrieve all stamps and +1 tweets for a particular user, retrieve all +1 tweets that contain a particular #hashtag, and retrieve all stamps.