If you’re worried about privacy on Facebook, it may be time once again to change your settings.

Facebook is finally rolling out its face-recognition technology, which automatically identifies people in photos, to all its 500 million users worldwide.

The technology, until recently, had been available only in the United States. But it is now being rolled out for everyone, according to a June 7 entry on Facebook’s blog. The setting is being changed automatically, without a user being asked for permission or having to do anything.

Facebook now allows you or a friend to upload new photos, and then uses face-recognition software to match your new photos to other photos you’re tagged in. It then groups similar photos together and suggests the name of the friend in the photos, according to the Facebook Blog.

But this kind of automatic tagging has some people concerned about their privacy. Internet security company Sophos is warning users to change their settings.

It has written to Facebook suggesting that there should be no more sharing of information without users’ express agreement or as “privacy by default” system.

The onus should not be on Facebook users to opt-out of the face-recognition feature, the company says. Rather, users should have to opt in.

According to Sophos: “Facebook is eroding the online privacy of its users by stealth.”

In the meantime, if you’re not happy with this form of tagging, here’s how to disable “Suggest photos of me to friends now:”

• First, go to the Accounts section on the top of your home page and choose Facebook’s Privacy Settings.

• Click on Customize settings.

• Under the section “Things others share,” you should see an option titled “Suggest photos of me to friends now. When Photos look like me, suggest my name.”

• Click on Edit Settings.

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If Facebook has already enabled this suggestion option, you will see an option that says: Enabled. To turn off the setting, all you have to do is change it to Disabled and then click on Okay.

The tagging option is still being rolled out, so if the option isn’t yet available for you and you’re worried, you should continue to check your settings for the next few days.

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