Especially with the Euro bill tracking, trackers have taken on a much more competitive nature and have formed communities within their respective sites. Many successful sites incorporate some sort of social media, either through site specific unique techniques, or through outside popular social media sites. In the Eurozone because multiple countries having adopted the Euro, this easily leads to competition between trackers in different countries; in the United States competition plays out at the state or county level; and in Canada, at the provincial level.