The Flickr site has lots of potential for sharing. The chance of finding friends by logging in and searching for them seems small. I think its utility is more about using groups to share photos and videos with others who are interested in sharing similar subjects or photographic styles.
This is a photo from interesting things on February 25th 2009 - My 50th birthday. It also has the hot air balloons that have captured by attention lately.
There are hundreds of pictures for any day you choose.