Tweets can be liked by users, adding them to a list that other users can view.[50] The feature was available when Twitter launched in 2006.[51] Until 2015, 'likes' were called 'favorites' (or 'favs'). The service renamed them because people "often misunderstood" the feature, and people reacted more positively in user tests.[52][53] Users have the option of hide the list from the public,[54] though the like is not hidden from the list of users who likes a given tweet.[55][56] Jack Dorsey said in 2019 that, if he had to create Twitter over again, he would deemphasize the like, or not include it altogether because it did not positively contribute to healthy conversations.[51]