Retweeting or sharing information on the micro-blogging site can actually make things worse for you as it creates a cognitive overload that interferes with learning and retaining what you've just seen researchers report. According to the team from Cornell University in the US that overload can spill over and diminish performance in the real world. Most people don't post original ideas any more. You just share what you read with your friends said Qi Wang professor of human development at Cornell. But they don't realise that sharing has a downside. It may interfere with other things we do he warned.