The divorce rate was going up long before online dating, and have actually been going down since the onset of online dating. Though I'm skeptical they're directly related.
https://www.washingtonpost.com/news/wonk/wp/2015/06/23/144-y...
https://www.washingtonpost.com/news/wonk/wp/2015/06/23/144-y...
I'm not blaming online dating (which I think is just a reflection of other cultural changes) but it's kind of hard to get divorced if you're not married and we know where marriage rates are going...