In a recent article in Recode, Kurt Wagner (@KurtWagner8) shares how Twitter is rolling out ad targeting based on app installs.

"For the past six months, Twitter has been collecting data on which smartphone apps its users download. Now, the company is using that data to make some money. Twitter announced on Wednesday that its advertisers can use that app information to target users with ads. Marketers will be able to target you based on the different categories of apps you have downloaded onto your phone as well as how recently you downloaded them."

If you are an advertiser, you are thrilled. This takes ad targeting to the next level, which is good because historically the ad targeting in the native twitter ads platform is awful.

If you are a Twitter user, you might see this as an invasion of privacy. It's one thing to be able to peek into your cellular data, and it is is another to use it for economic gain.

Over the next couple months, we'll see advertisers get very aggressive around this ad targeting. Once the dust settles, Twitter may be forced to allow it's users to opt-out of this advertising targeting as people start to complain about privacy.