Twitter is back in experimental mode, but its latest test is annoying people. A sizable number of users are seeing tweets favorited by others in their timeline, just like retweets. They are also getting notifications when others follow someone new. This was first brought to my attention a couple of weeks ago, but Twitter appears to have widened the experiment to cover more users over the past few days. TNW’s own editor-in-chief Martin Bryant, Re/Code’s Peter Kafka and prominent US investor Hunter Walk are among those seeing these notifications. Twitter’s recent experiments have been fairly innocuous — it removed Bing translations, hinted at commerce services, and began embedding tweets on the Web — but these new notifications are upsetting users because they are confusing and seemingly unnecessary.