The Daily Mail has compared it to Gerald Ratner's famous comment that destroyed his cut-price jewellery empire. That might be over-stating it a bit, but Christopher "Biz" Stone, the co-founder of Twitter, has told the 500 million users of the micro-blogging site it is "unhealthy" to tweet too much. He said he reckons people should dip in and dip out – not slavishly and obsessively monitor the service – but didn't want people to leave altogether. "Obviously, we want you to come frequently," he said.
