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Nearly one-third of all photos uploaded to Flickr in 2015 were taken on an iPhone

According to a year-end report from Flickr, Apple's iPhone extended its lead as photo sharing service's most-used camera brand during 2015, accounting for almost one-third of all images uploaded to the site.

Flickr's full Year in Review, published on Friday, shows iPhone's brand share grew from about 25 percent to around 30 percent over the past year, as previous No. 1 Canon declined to roughly 20 percent during the same period. Earlier this month Flickr revealed Apple's iPhone 6 and iPhone 5s to be the most popular cameras of 2015.

Overall, 23 percent of photographers used some variation of iPhone to capture Flickr photos, as seven models dating back to iPhone 4 landed in the top 10 most used camera list. Apple's iPhone 6, iPhone 5s, iPhone 5, iPhone 4s, iPhone 4 and iPhone 6 Plus made up Flickr's top 6 cameras, respectively, while iPhone 5c came in 8th just after Canon's EOS 5D Mark II.

Samsung was the only other smartphone brand to place in Flickr's top 20 list, with the Galaxy S4 and Galaxy S5 coming in at No. 11 and No. 13, respectively. Samsung's Galaxy S III placed 19th, sandwiched between two Nikon DSLRs. Together, Samsung's Galaxy handsets were used by 3.8 percent of Flickr photographers.

Taking a look at popular camera pairings reveals an interesting progression of hardware combinations reflective of iPhone's high upgrade rates. Flickr notes the top 18 pairings were iPhones and iPhones, for example an iPhone 6 and iPhone 6s. While some photographers might be dual-fisting iPhones out in the field, a more reasonable explanation is that Apple device owners simply updated their hardware sometime over the past 12 months.

The top camera pairing for 2015 was Apple's iPhone 5s and iPhone 6 with 5.4 percent of photographers. Not counting the next 17 pairings, which were iPhone and iPhone, Flickr found the most popular combinations to be some iPhone variant with a Canon DSLR.

Since arriving on the scene in 2007, iPhone has quickly become the world's leading mobile photography platform. That Flickr is seeing a boom in images shot on iPhone should come as no surprise, as Apple's yearly camera upgrades and advancements in cellular data technology — not to mention a healthy share of the global smartphone market — perfectly complement online photo sharing services.