Construktiv is a German developer responsible for creating Mister Wong and Lifestream.fm
Mister Wong is a free web service, which enables users to save their favorite websites easily and have access to them from anywhere online. Mister Wong is Europeâ€™s largest social bookmarking site. The service was founded in Germany by Kai Tietjen in March 2006 and has since grown to include 6 localized language versions (.de, .com, .fr., .es, .ru, .cn). The English version was launched in August 2008.