To be perfectly exact, it was big data from cheap phones that made it there as smartphone prices have finally dropped to low-enough levels to make them truly massive. This has huge implications for society. For instance, data from phones in a region in Kenya allowed to better understand the reason for malaria spreading around and contain it in the future.
Smartwatches on the other hand have been around for a while, but in 2013 with the launch of the Pebble they are starting to get some momentum they lacked previously. With Bluetooth 4.0 with its low energy profile and in a combination with a smartphone, one might just realize that smartphones may help our lives without ever leaving our pockets.
The other 8 breakthrough technologies of 2013 were deep learning, temporary social media with self-destructing messages, pre-natal DNA sequencing, additive manufacturing, Baxter: the blue-collared robot, memory implants, ultra-efficient solar power and supergrids.
source: MIT Technology Review