One of the most recognizable typefaces in existence to this day, Comic Sans has been intensely debated by graphic designers who hate it and the others who love it (ironically).

This classic photo fad from Flickr continues to evolve on Tumblr with "photo-in-photo"-themed single topic blogs like Dear Photograph and Looking into the Past, Washington Post reports.

A D.I.Y fashion tip gets turned into an ironic photo fad among male bloggers on Tumblr!

French fashion retailer La Redoute causes a stir (and a photoshop meme) after accidentally publishing an ad with a nudist man on its website.

Note: images in this entry may be NSFW.

From feminist literature and medieval history to biostatistics and international development, this A-list Hollywood actor has also emerged as Tumblr's poster child in every academic discipline one can think of.