The U.S. social media company’s latest addition is a subtle piece of information that shows the client that each tweet is sent from. In doing so, the company now displays whether a user tweets from the web or mobile and, if they are on a phone, whether they used Twitter’s iOS or Android apps, or a third-party service.

The feature — which was quietly enabled on Twitter’s mobile clients earlier this month; it has long been part of the TweetDeck app — has received a mixed response from users since CEO Jack Dorsey spotlighted it.

Some are happy to have additional details to dig into for context, for example, whether a person is on mobile or using third-party apps, but others believe it is an unnecessary addition that is stoking the rivalry between iOS and Android fans.

Interestingly, the app detail isn’t actually new. Way back in 2012 — some six years ago — Twitter stripped out the information as part of a series of changes to unify users across devices, focus on service’s reading experience and push people to its official apps where it could maximize advertising reach.

That was a long time ago — so long that TechCrunch editor-in-chief Matthew Panzarino was still a reporter when he wrote about it; he and I were at another publication altogether — and much has changed at Twitter, which has grown massively in popularity to reach 330 million users.

Back in 2012, Twitter was trying to reign in the mass of third-party apps that were popular with users in order to centralize its advertising to get itself, and its finances, together before going public. Twitter’s IPO happened in 2013 and it did migrate most users to its own apps, but it did a terrible job handling developers and thus, today, there are precious few third-party apps. That’s still a sore point with many users, since the independent apps were traditionally superior with better design and more functions. Most are dead now and Twitter’s official apps reign supreme.

Many Twitter users may not be aware of the back story, so it is pretty fascinating to see some express uncertainty at displaying details of their phone. Indeed, a number of Android users lamented that the new detail is ‘exposing’ their devices.

I could go on — you can see more here — but it seems like, for many, iPhone is still the ultimate status symbol over Android despite the progress made by the likes of Samsung, Huawei and newer Android players Xiaomi and Oppo.

While it may increase arguments between mobile’s two tribes, the feature has already called out brands and ambassadors using the ‘wrong’ device. Notable examples including a Korean boyband sponsored by LG using iPhones or the Apple Music team sending a tweet via an Android device. Suddenly spotting these mismatches is a whole lot easier.