You can use these Tumblr features as Feeds content sources:
Username: Use the username of a tumblr blog (found in the tumblr url, so for http://generalelectric.tumblr.com it'd just be "generalelectric") to pull in all of that blog's posts.
Hashtag: Pull in any posts that have a certain hashtag on tumblr. Keep in mind, if you are missing posts, that tumblr has a few rules when it comes to hashtagging posts.
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