I suddenly realized that photo-sharing sites such as Ipernity may be (some day) infringing on a flickr patent! You'll have to read to read the details in the application, but in its method of claims includes all "groups" and "taggings"  .. 

 

What is Interestingness?

Interestingness is what Flickr calls the criteria used for selecting which photos are shown in Explore. All photos are given an Interestingness "score" that can also be used to sort any image search on Flickr. The top 500 photos ranked by Interestingness are shown in Explore. Interestingness rankings are calculated automatically by a secret computer algorithm. The algorithm is often referred to by name as the Interestingness algorithm. Although the algorithm is secret, Flickr has stated that many factors go into calculating Interestingness including: a photo's tags, how many groups the photo is in, views, favorites, where click-throughs are coming from, who comments on a photo and when, and more. The velocity of any of those components is a key factor. For example, getting 20 comments in an hour counts much higher than getting 20 comments in a week.

Does Flickr really have a patent on Interestingness?

bighugelabs.com/flickr/faq.php?section=scout#31

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United States Patent Application20060242139
Kind CodeA1
Butterfield; Daniel S. ;   et al.October 26, 2006

Interestingness ranking of media objects 

Abstract

Media objects, such as images or soundtracks, may be ranked according to a new class of metrics known as "interestingness." These rankings may be based at least in part on the quantity of user-entered metadata concerning the media object, the number of users who have assigned metadata to the media object, access patterns related to the media object, and/or a lapse of time related to the media object.

appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1=%2220060242139%22.PGNR.&OS=DN/20060242139&RS=DN/20060242139