Google has a long history of tracking user activity, and the introduction of its Chrome operating system later this year is sure to follow suit. While we know that it's being built off of Linux, one big thing we don't know is how its terms of service will differ from those found in other Google products, and what kinds of user data it will be collecting. Based on the company's track record of watching and monetizing user data, it could be anything from which applications you're using, to all the information that's coming in and out of your computer.
To provide a better picture on what to expect, let's take a look at some of the ways Google is currently monitoring user activity in a handful of its products and how that may trickle down into the OS:

Google personalized Web search--Google's bread and butter business is its search engine, and its personalized search is a way to put a face on the data. When you're signed in with your Google account you can opt in to having your Web history tracked; Google archives all of the sites you've clicked on from search results, as well as what time of day you clicked on them.

For those who are not signed in, the company uses identifiers like cookies and IP addresses. But when you're signed in it can actually aggregate that data no matter what computer you're on. With a system-level log-in, it could theoretically do this no matter what browser you're using, giving Google a far richer set of data.

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