It wasn't the only smartphone. And it's not like the internet appeared simultaneous with the iPhone. It was just a different way to get access to the same websites, back when it launched, most of which didn't support the iPhone's screen size anyway. And the only difference was that it made it easier to reach those websites ... outside. On the move. Where you are more likely to meet people.
Their causal explanation here does not ring true in all sorts of ways. Nobody was deciding not to get married and have kids because they were too busy watching porn on an iPhone in 2007, a time when video on smartphones barely worked. Social media predated the iPhone by years. And this practice of controlling for some ad-hoc list of things and then announcing causality is a major cause of spurious false positive claims in academic science. They really should know better than to make strong claims of causality in a case like this. Sociology just isn't capable of explaining things like this no matter how many stats you throw at it.
There's much better work out there on this topic that is less heavy on the cute regressions and more heavy on the historical analysis+common sense. It's often a lot more convincing.
Their causal explanation here does not ring true in all sorts of ways. Nobody was deciding not to get married and have kids because they were too busy watching porn on an iPhone in 2007, a time when video on smartphones barely worked. Social media predated the iPhone by years. And this practice of controlling for some ad-hoc list of things and then announcing causality is a major cause of spurious false positive claims in academic science. They really should know better than to make strong claims of causality in a case like this. Sociology just isn't capable of explaining things like this no matter how many stats you throw at it.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4816570/
There's much better work out there on this topic that is less heavy on the cute regressions and more heavy on the historical analysis+common sense. It's often a lot more convincing.