Reblogging is not a new idea (see http://www.reblog.org/),
Reblog is a PHP-based server-side RSS aggregator/reader that allows for quick, easy, iterative filtering, editing and re-syndicating of posts. Its output is an RSS feed that contains numerous metadata necessary to re-publish posts with appropriate attribution.
Eyebeam's reblog represents one such example. Developed and named by Jonah Peretti, Michael Frumin, Michael Migurski, Alex Galloway and Boris Anthony, the Movable Type hack dubbed "reblog", was designed in early 2004, as a means of making web surfing, re-posting and crediting material easier. Today, we see permutations of the curating technology first built at the Atelier, all over the web. The most popular software operating off the same principles—Tumblr blogs and Facebook feeds—allows users to easily re-post material and create their own custom feed readers, just like the Eyebeam reblog.
Reblogging was a feature we had planned from the start, but cut it from the first version of Tumblr at the last minute because we weren’t happy with its implementation. (The version of reblogging that appeared in Tumblr’s second version was completely rethought and much better.)