Eight smart uses for vinegar

Now that you know ketchup can be used for shining copper and repairing hair, or that vodka can be used to repel insects and freshen laundry, you may have been wondering what tasks you can get done for cheap with other household items.

Since May is National Vinegar Month (did you forget?), we thought we’d take a closer look at this inexpensive, versatile good.

According to the Vinegar Institute, the useful stuff was probably discovered by accident (most wine drinkers know what happens when you leave a bottle sitting around too long). In fact the word vinegar comes from a French translation for “sour wine.”

Websites ‘keeping deleted photos’

User photographs can still be found on many social networking sites even after people have deleted them, Cambridge University researchers have said.

They put photos on 16 popular websites – noting the web addresses where the images were stored – and deleted them.

The team said it was able to find them on seven sites – including Facebook – using the direct addresses, even after the photos appeared to have gone.

Facebook says deleted photos are removed from its servers “immediately”.

The Cambridge University researchers said special photo-sharing sites, such as Flickr and Google’s Picasa, did better and Microsoft’s Windows Live Spaces removed the photos instantly.

BAD NEWS ABOUT ‘DELETE’

It’s always fun to write about research that you can actually try out for yourself.

Try this: Take a photo and upload it to Facebook, then after a day or so, note what the URL to the picture is (the actual photo, not the page on which the photo resides), and then delete it. Come back a month later and see if the link works. Chances are: It will.

Facebook isn’t alone here. Researchers at Cambridge University (so you know this is legit, people!) have found that nearly half of the social networking sites don’t immediately delete pictures when a user requests they be removed. In general, photo-centric websites like Flickr were found to be better at quickly removing deleted photos upon request.

Why do “deleted” photos stick around so long? The problem relates to the way data is stored on large websites: While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution. It’s a complex system wherein data is copied to multiple intermediate devices, usually to speed up access to files when millions of people are trying to access the service simultaneously. (Yahoo! Tech is served by dozens of servers, for example.) But because changes aren’t reflected across the CDN immediately, ghost copies of files tend to linger for days or weeks.

In the case of Facebook, the company says data may hang around until the URL in question is reused, which is usually “after a short period of time.” Though obviously that time can vary considerably.

Of course, once a photo escapes from the walled garden of a social network like Facebook, the chances of deleting it permanently fall even further. Google’s caching system is remarkably efficient at archiving copies of web content, long after it’s removed from the web. Anyone who’s ever used Google Image Search can likely tell you a story about clicking on a thumbnail image, only to find that the image has been deleted from the website in question — yet the thumbnail remains on Google for months. And then there are services like the Wayback Machine, which copy entire websites for posterity, archiving data and pictures forever.

The lesson: Those drunken party photos you don’t want people to see? Simply don’t upload them to the web, ever, because trying to delete them after you sober up is a tough proposition.