This article was written in 2012. It might or it might not be outdated. And it could be that the layout breaks. If that’s the case please let me know.
Forgotten Browsers on Mobile
Whenever I see a list of mobile browsers there’s always one browser that I miss: the browser that’s inside the Twitter app. Or any other app that people use to connect to their social networks. In my case, the built-in browser in TweetBot is the browser I use most by far. I click on most links people tweet and I buy lots of things in that browser when people recommend it. People with Android devices seem to be surprised whenever I say this, so I assume apps on Android don’t have a built-in browser. But apps on iOS definitely have them and they are used quite often. You should probably test your sites in these apps too since their viewports tend to be different.