Google, Samsung, HTC, Opera and others celebrate April Fools' Day with pranks

It's not April Fools' Day if Google (NASDAQ:GOOG) isn't throwing a few pranks into the mix. Today Google introduced to users who were logging on to their Gmail account a special offer for the "Shelfie: selfies with personality." Google wrote that with Shelfies (Shareable Selfies) users set their own photo as a Gmail custom theme and then can share it with their friends. Google also created a Pokémon Challenge--"the most rigorous test known to man"--where users have to catch all the Pokémon characters hidden throughout the latest version of Google Maps.

Other companies got into the act as well. Both Samsung and HTC introduced similar ideas for smart gloves. Nokia (NYSE:NOK) said it would bring back its iconic but old-school 3310 phone complete with Windows Phone and a 41-megapixel camera. And Opera Software even introduced its first feline-friendly browser for cats called Cats by Opera. Engadget has a good rundown of all the April Fools' pranks here.