The Library of Congress announced that they will be posting photographs from the late 1800's and early 1900's on Flickr. What help the young users of Flickr might be in identifying who snapped a 100-yr. old photograph, is anyone's guess.
Maybe their next project will have iTunes users remix an 1881 recording of Thomas Edison playing the ocarina.
Matt Raymond writes on the LoC blog:

"The real magic comes when the power of the Flickr community takes over. We want people to tag, comment and make notes on the images, just like any other Flickr photo, which will benefit not only the community but also the collections themselves. For instance, many photos are missing key caption information such as where the photo was taken and who is pictured. If such information is collected via Flickr members, it can potentially enhance the quality of the bibliographic records for the images."
Doesn't he understand what kinds of tags he's going to get on his photos?
These are my guesses for what kids will tag pictures of people from 100 years ago:
in heaven;
in hell;
worm food;
corpse smells like cheese;
Gramma!;
don't care.
I'll get the ball rolling by identifying this photo with the following caption:
Angstrom Moot, the famous Vaudeville ferret juggler waits to show his act to Flo Ziegfield.I'm glad I could help.