Facebook posted a white paper on Monday morning. One of the facts from the white paper is that 250 billion photos have been uploaded to the social network and they are seeing around 350 million user uploads per day.
The social network is also seeing 4.75 billion content items being shared per day. There are around 4.5 billion Likes and 10 billion messages per day.
Facebook hit 10 billion photo uploads around the middle of 2011, which really shows how much has grown in the last 2 years.