“Tweets, accounts, or other content to your timeline that we think you’ll find especially interesting.“
“To help build a more personal Twitter experience for you, we are collecting and occasionally updating the list of apps installed on your mobile device so we can deliver tailored content that you might be interested in.” states Twitter in a post that explain the concept of app graph. “We are only collecting the list of applications you have installed. We are not collecting any data within the applications.”
Twitter has recently updated the mobile app for iOS platform, adding the “app graph” feature, meanwhile the Android version will be issued the next week.
“Additionally, if you have previously opted out of interest-based ads by turning on “Limit Ad Tracking” on your iOS device or by adjusting your Android device settings to “Opt out of interest-based ads,” we will not collect your apps unless you adjust your device settings.” continues the company post on the app graph.
Using Twitter for iOS: