I went on Taylor Swift's Wikipedia and in the associated acts spot it said Jonas Brothers, Miley Cyrus, Selena Gomez and Creed. I know she did a duet with Jonas Brothers and Miley Cyrus but I don't remember her doing one with Selena Gomez or Creed. If it doesn't mean Duets, What does it really mean?
Artists they may have worked in other ways with, maybe song writing or producing. It may also mean artists that the media associates them with.
As well as this, don't trust every single thing you read on Wikipedia, it is edited by anyone
Taylor Swift Mean Wiki
Only 4 serious errors were found in Wikipedia, and 4 in Encyclopædia Britannica. The study concluded that "Wikipedia comes close to Britannica in terms of the accuracy of its science entries", although Wikipedia's articles were often "poorly structured".