The UK's third largest supermarket will pitch itself against online titan Amazon with the acquisition of the shareholding from struggling HMV for a nominal £1. It said it expects to own a 64% stake in online digital book retailer and social network Anobii after investing in the group. Anobii allows people to buy e-books to read on a range of devices including e-readers, tablet computers and smartphones. The social network element of the site allows users to rate and review titles, which can be shared with other Anobii members and websites.