May 27, 2015 | Sinead

When I use my phone, I never worry if anyone knows what I'm doing or who I'm with. This week researchers have shown that they can estimate how big a crowd is based on the internet usage and number of tweets, calls and texts in the area. Usually when people try to work out how many people are at an event they guess or use photos - and aren't very accurate.

I'm not sure I like the idea of my phone giving away my location, especially if I don't know who has access to that information.

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Crowd with phones

The researchers use clever algorithms and mobile phone data to estimate crowd sizes with an error of only 13%.

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Image: Flickr/Abd allah Foteih

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