According to Compete.com May data Twitter’s growth shows signs of slowing down. This had to happen at some time and May seems to be the month were traffic to the Micro Blog site Twitter started to slow down, the traffic is up by 1% according to Compete.com. Visits to the site have been on a sharp rise over the past six to twelve months with majority of users orienting from the USA. Users are now 19.7 million unique visitors but growth in the USA may be flattening.