[UK] Today in London a couple of hundred delegates turned up to Jeff Pulver's 140 Conference to jaw-jaw over the nature and impact of business and society of, well, Twitter.

But as various startups and social media pundits took to the stage to debate the mostly positive impact Twitter will have, a much darker side has appeared on the social site in the last few days @Dinner_Guest is tweeting some extremely dark stuff.

Most if it is decidedly not suitable for work, and read like passages from the novel about a killer, American PsychoOf course, this is no surprise - Twitter is big enough now to attract all sorts of crazy people..