An Istanbul-themed Instagram competition, "#oneistanbul," began at the CNR EXPO Yeşilköy Fair Center this week. Instagram users are invited to share their Istanbul-themed photographs with the hashtags "Istanbul" and "oneistanbul" throughout the year. The top three winners will be presented notebooks, smartphones and tablets. The competition covers four three-month periods with different Istanbul themes. The jury committee will announce the best three photos in each period. All photos will be shared on the websites www.howtoistanbul.com and www.istanbuluseyret.com. To increase the visibility of Istanbul, the Instagram competition was organized by the Istanbul Metropolitan Municipality, the Istanbul Chamber of Commerce (İTO) and Istanbul Congress and Visitors Bureau (ICVB). The opening ceremony was overseen by İTO and ICVB President İbrahim Çağlar and Istanbul Metropolitan advisor to the mayor, Tülin Ersöz. Photographer Mustafa Seven, a well-known name in the Instagram world, commenced the competition with his photos. OneIstanbul started as a part of the 6th International Photography, Digital Screening, Album, Advertisement and Printing Technologies and Equipment Fair running until Sunday. The event team informs interested visitors about the competition at the fair venue.