Amazon's S3 hosting service stores over one trillion objects

"Late last week the number of objects stored in Amazon S3 reached one trillion (1,000,000,000,000 or 1012). That's 142 objects for every person on Planet Earth or 3.3 objects for every star in our Galaxy. If you could count one object per second it would take you 31,710 years to count them all.
We knew this day was coming! Lately, we've seen the object count grow by up to 3.5 billion objects in a single day (that's over 40,000 new objects per second)."

Source:  Amazon S3 blog, 12th June 2012

Note - Not entirely sure what constitutes an 'object' but presumably a picture is one object, and a piece of text (but I'd guess it's more than a character of text)

Here's a definition