I think there are few people who are not familiar with the pioneering photo storage Flickr. Yahoo bought it back in 2005 and is now selling it to SmugMug. This company has been running a photo sharing server for many years. Flickr still has more than 75 million users, and while it has lost popularity to Instagram in recent years, a sale to a new company could revive it a bit. The company has pledged to invest in Flickr and restore it to its former glory.