Facebook and its Messenger application dominated Nielsen’s list of the top apps of 2015.
The flagship Facebook app and Messenger placed at Nos. 1 and 3, respectively, on Nielsen’s list of top smartphone apps of 2015 by users, creating a sandwich around second-place YouTube.
Messenger also posted the highest year-over-year change in users, at 31 percent, outpacing second-place Apple Music (26 percent)....
Via Jeff Domansky
What's app according to Nielsen research.