Whenever I shoot something, I take a lot of pictures because I love the way the people in the photos change from one shot to the next.
Scrolling past these photos changes the perspective slightly, alerting people to their presence, and from there all the interactions feel natural.
Parents can tag their kid in other people's photos, too, and get a notification if the privacy setting of those photos changes.
With the Brushes feature, you drag your finger across parts of the photo to change its light, color saturation, red eye or clarity, among other things.
Susanna Booth is a food writer and food stylist based in London; widecirclecooking.com Correction: the photo was changed on this article on 19 March 2014 to more accurately reflect the content.
The photo preview change does at least have an opt out on mobile.
Worst case scenario is, a "bad guy" can simply swipe out the photo and change the embedded information to show that he's an upstanding U.S. citizen.
Click anywhere to on the picture to refocus, drag your mouse around the photo to change the perspective.
And like every other Cover photo change, the news is posted to your Facebook News Feed so your friends can like and comment on the picture.
The Guardian talked to Särmä about the photos, the changes she's hoping to see, and why David Hasselhoff is the perfect mascot for the project.
