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SAN FRANCISCO — Want to use a new app or website? Want to log in? Maybe with Facebook? Now, you no longer have to share your whole life just by logging in with Facebook.

At Facebook’s f8 developer conference, we learned today that the company is making big changes in how it shares your information around the Web.

“We serve a lot of different communities, but one is by far the most important: the people that use our products,” said Facebook CEO Mark Zuckerberg during his keynote. “It’s important that in every single thing we do, we put people first.”

That means the company is going to make a huge bid for your trust by making your data more secure. When you use Facebook to log in to another app, you’ll now see a whole checklist of every bit of data that app wants to use — and you can pick and choose which bits you want to share.

You can even login anonymously.

Facebook’s current active user count sits at an unparalleled 1.28 billion people — that includes more than a billion people who access Facebook from their mobile phones every month.

And of course, all those eyeballs mean big money for the social media company. In the first three months of 2014 alone, Facebook raked in a whopping $2.5 billion in revenue. That number makes up almost 18 percent of the worldwide ad spend, according to research firm eMarketer.

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