April Fools’ Day jokes are by and large disappointing — Google aside — but there is some hope outside of Mountain View. Here’s what companies other than Google did that was actually interesting. Tumblr — Tumblr Pro Tumblr pranked a lot of its young userbase after it added a button to allow users to upgrade to ‘Tumblr Pro’ on its microblogging service. Clicking to upgrade to the free service, users are shown a video designed to inspire creativity within… and are ultimately rewarded only with a hat for their avatar. I activated Tumblr Pro and this happened???????????????? pic.twitter.com/OOqiCtvqp0 — LadyPipit’s...

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