The website now shows tweets and retweets posted by accounts that one personally follows. Some users are seeing a few tweets in their timelines that have merely been favorite by accounts they follow. Other tweets are showing from accounts that your friends follow, The Verge reported.
The experiment is concerning people as the 'favorite' feature is not as widely used by users. The feature is treated as a simple acknowledgment of receiving a tweet or as a way of saying 'thanks.'
It can also be a simple way of saying that you found something funny. Others use it as a type of bookmarking system.