# New tool predicts which photos will go viral on Facebook (HT Tech) > Scientists have developed a computer algorithm that predicts whether a photo will go viral on Facebook by watching how fast it is shared. # New tool predicts which photos will go viral on Facebook ## Scientists have developed a computer algorithm that predicts whether a photo will go viral on Facebook by watching how fast it is shared. Apr 07 2014, 11:01 IST ![Follow on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/follow-us-facebook.png) ![Follow on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/follow-us-facebook-hover.png) ![Share](https://images.hindustantimes.com/tech/static/revamp/images/png/Share.png) ![Share](https://images.hindustantimes.com/tech/static/revamp/images/png/Shareclicked.png) ![Share on WhatsApp](https://images.hindustantimes.com/tech/static/revamp/images/png/whatsapp.png) ![Share on WhatsApp](https://images.hindustantimes.com/tech/static/revamp/images/png/whatsapp-hover.png) ![Share on Twitter](https://images.hindustantimes.com/tech/static/revamp/images/png/twitter.png) ![Share on Twitter](https://images.hindustantimes.com/tech/static/revamp/images/png/twitter-hover.png) ![Share on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/facebook.png) ![Share on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/facebook-hover.png) ![Bookmark](https://images.hindustantimes.com/tech/static/revamp/images/png/Bookmark.png) ![Bookmarked](https://images.hindustantimes.com/tech/static/revamp/images/png/Bookmarked.png) ![image caption](https://images.hindustantimes.com/tech/rf/image_size_800x600/HT/p1/2011/12/27/Incoming/Pictures/787703_Wallpaper2.jpg) ![Author Photo](https://images.hindustantimes.com/tech/static/revamp/images/png/HTTech-new-circle-logo.png) ### By PTI Scientists have developed a computer algorithm that predicts whether a photo will go viral on Facebook by watching how fast it is shared. Stanford researchers said the clues to predicting which of the many millions of photos on Facebook will spring from obscurity and go viral lie in 'cascades'. The term 'cascades' is used to describe photos or videos being shared multiple times. "It wasn't clear whether information cascades could be predicted because they happen so rarely," said Jure Leskovec, assistant professor of computer science. Also read click here. According to data provided by Facebook scientists in a recent collaboration with university scientists, only 1 in 20 photos posted on the social network gets shared even once. And just 1 in 4,000 gets more than 500 shares - a lot but hardly an epidemic. In a paper to be presented at the International World Wide Web Conference in Seoul, Korea, the researchers will describe how they accurately predicted, 8 out of 10 times, when a photo cascade would double in shares; that is, if a photo got 10 shares, would it get 20? If it got 500, would it reach 1,000, and so on? The team including Leskovec, Stanford doctoral student Justin Cheng, Facebook researchers Lada Adamic and P Alex Dow, and Cornell University computer scientist Jon Kleinberg began by analysing 150,000 Facebook photos, each of which had been shared at least five times. The data were stripped of names and identifiers to protect privacy. A preliminary analysis of those photos revealed that, at any given point in a cascade, there was a 50-50 chance that the number of shares would double. The scientists then looked for variables that might help them predict doubling events more accurately than a coin toss, including the rate and speed at which photos were shared, and the structure of sharing (photos reposted in multiple networks proved to create stronger cascades). After factoring several criteria into their analysis the computer scientists were able to accurately predict doubling events almost 80 % of the time. Their algorithm became more accurate the more times a photo was shared. For photos shared hundreds of times, their accuracy rate approached 88 %. The speed of sharing was the best predictor of cascade growth. Simply analysing how quickly a cascade unfolded predicted doublings 78 % of the time. "Slow, persistent cascades don't really double in size," Leskovec said. How a photo was shared - scientists call this the structure of the cascade - was the next best predictive factor. Photos that spread among different friendship networks or fan groups indicated a breadth of interest. Structure proved 67.1 % accurate at predicting doubling when used alone. Catch all the Latest Tech News, Mobile News, Laptop News, Gaming news, Wearables News , How To News, also keep up with us on Whatsapp channel,Twitter, Facebook, Google News, and Instagram. 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