I still maintain that if only Yahoo had any intent to do anything rather than sit around back then, Flickr would have won in the field of photo sharing and photo social media, and it would have been a much better end result for the users.

Now that it's not owned by Yahoo any more but smugmug there's still a shimmer of hope for a revival.

Search engine and instant messenger - Yahoo could have been Google & Facebook if they had been managed competently.

I was surprised that I can't share a HD image on flickr with someone on mobile and have them be able to see the full image. If I remember correctly, it shows them a bulky UI with a scaled down version of the image.

Ah but they have previously. They (at the time Yahoo) used non Creative Commons Flickr images in ads. This made me delete my old school pre Yahoo account and remove everything I uploaded.