Twitter is tracking the apps on your phone

Gigaom

In its latest effort to improve its ad targeting, Twitter will start collecting information on what mobile apps its users have downloaded.

If you’re in the Pandora camp instead of the Spotify camp, Twitter will know. Harbor a penchant for celebrity gossip with both the TMZ and Perez Hilton app in your arsenal? Twitter will know. If you’re on a diet and you’re tracking your calories with an app, Twitter will know.

The company says it’s using the information to benefit you, by improving its recommendation engines on other Twitter accounts you should follow. As mentioned in the Twitter Analyst Call, an “instant timeline” for new users is also on its way. Information on what apps a person has downloaded could help Twitter build that.

The second purpose, one not mentioned by Twitter in its blog post, is the holy grail of free consumer web companies: Ad targeting. Twitter needs as much information…

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