Snooping on your home screen

mobileapps

Apps have been pinging other apps on the phone to detect whether they are installed or not for a while. In fact there are a couple of startups that provide SDKs to do it.

Doing this provides insight into the type of user the owner of the device is, which allows the publisher to provide more targeted features & experiences as well as advertising. For example, if you have a bunch of baby apps, shopping apps, or coupon apps then you are most likely a female with a new baby.

Read more: http://recode.net/2014/11/26/twitters-now-collecting-data-on-which-apps-you-download