The popular photo sharing site Flickr reached 3 billion hosted photos this afternoon (at about 6 PM CET), at least if the numbering of the photos accurately reflect the actual amount of photos on the site. The growth has been steady during the last 12 months. It took six months between 2 billion and 2.5 billion, and then another six months to reach 3 billion photos.
Photo number 3,000,000,000 can be found here.
Previous posts about the growth of Flickr: 2.5 billion and 2 billion.
Data set used:
22 Oct 04: 1000000
20 Apr 05: 10000000
15 Feb 06: 100000000
22 Sep 06: 250000000
15 May 07: 500000000
19 Jul 07: 850000000
20 Aug 07: 1180000000
06 Oct 07: 1500000000
13 Nov 07: 2000000000
17 May 08: 2500000000
03 Nov 08: 3000000000
Update: Confirmed by Flickr.