It's barely five years old, but the microblogging platform Tumblr already rakes in 15 billion page views every month. With all that buzz, we thought we'd showcase the best accounts out there (with some help from TIME's Tumblr followers, who nominated their own favorites).
Think you know your historical figures? Wait until you see how they wrote letters. Letterheady displays the stationery of luminaries from Harry Houdini to Groucho Marx to Thomas Edison. They’re not writing you personal notes, but this is the next best thing.
