I think it’s fair to say that Tumblr is the least of the free blog services on the net. I’ve tried to begin a blog on Tumblr four times, and each time I came running back to WordPress.
Tumblr’s use is only for image dumps, which are, generally-speaking, poorly curated. So far, Chicago Past is a beautiful collection, but I would like to point out that these photographs are not attributed to their creator or their publisher, the dates are missing for the most part, and as far as historical references, anyone not already familiar with Chicago’s past would be unable to place these shots in the modern grid.
It’s a neat Tumblr, but the Chicago Historical Society is rife with documented photographs.