Once the update is installed, users will be able to add a hashtag to a photo's title or description and search for other photos by their respective hashtags.
Hashtags are a form of metadata tag in which a word or a phrase of words is strung together without spaces behind a pound sign. Twitter first made hashtags popular back in 2009, when the company began hyperlinking them to search results.
Since then, hashtags have become a widely used means of depicting and categorizing data. Hashtag support has been extended to sites such as Google + and Instagram. There is even talk that social network Facebook might be planning to add hashtag support.
To promote the new hashtag support, Flickr has started a new weekly photo challenge called #FlickrFriday. The photo challenge will feature a new theme every week. Participating users will tag their photos with the #FlickrFriday hashtag. Flickr will then feature a selection of the best submissions on its blog the following week.
The new version (2.11.820) is available now as a 20.5MB download. The app is free in Apple's App Store.
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