Companies are increasingly turning to social media sites such as Wikipedia, YouTube and SlideShare to communicate with investors, a report shows.

The annual "Webranking" by Hallvarsson & Halvarsson, a financial communications consultancy, found that 81 per cent of the 150 largest companies in Europe put information about themselves on Wikipedia, the online encyclopedia that anyone can edit. More than half also put photography on Flickr, videos on YouTube and presentations on SlideShare.