The Guardian's style guide[1] has it in lowercase, as does the BBC News[2]. Reuters[3] is slightly more nuanced: Capitalise as a noun, lower case as an adjec

The Guardian's style guide[1] has it in lowercase, as does the BBC News[2]. Reuters[3] is slightly more nuanced: Capitalise as a noun, lower case as an adjective e.g. internet banking, internet cafe. [1] http://www.theguardian.com/styleguide/i http://www.theguardian.com/styleguide/i [2] http://www.bbc.co.uk/academy/collegeofjournalism/how-to/news-style-guide/i http://www.bbc.co.uk/academy/collegeofjournalism/how-to/news... [3] http://handbook.reuters.com/index.php?title=I#Internet http://handbook.reuters.com/index.php?title=I#Internet