Yahoo this week posted the 2015 retrospective of Flickr and showed that once again the iPhone was the camera most used by its millions of photographers.

Based on EXIF data analysis, the Apple smartphone leads with 42% of all photos sent to the service, against 27% for Canon EOS and 16% for Nikon D.
Here, a chart by type of device used:

The camera phones evidently they also lead with 39%, followed by DSLR cameras with 31%, simple cameras (point-and-shoot) with 25% and cameras without a mirror (mirrorless) with only 3%.
This Flickr page about cameras brings more details and graphics, for those interested.

(via Cult of Mac)