On Wednesday (June 13th), Yahoo! Photos began encouraging its users to switch to Flickr.com and other online photo sharing sites in preparation for their September 20th closing. However, the service is effectively closed now if you do not already have an account or have never uploaded photos there as they are not accepting new accounts.
Meanwhile, uploads on Flickr.com are going through the roof. From June 1 to June 12, Flickr averaged about 1.5 million uploads per day. From June 13 to June 18, Flickr averaged 4.1 million uploads, a 173% increase.
Click the chart below to see it larger: