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Nick Jonas posted this image of himself and Kevin Jonas on Instagram with the caption 'Gun range with @kevinjonas & @papajonas' credit: Nick Jonas/Instagram 03.07.12 Supplied by WENN.com (WENN does not claim any Copyright or License in the attached material. Any downloading fees charged by WENN are for WENN's services only, and do not, nor are they intended to, convey to the user any ownership of Copyright or License in the material. By publishing this material, the user expressly agrees to indemnify and to hold WENN harmless from any claims, demands, or causes of action arising out of or connected in any way with user's publication of the material.)

What is Yammer, Tumblr, Twitter? A social media field guide

From Yammer and Twitter to Tumblr and Flickr, we offer definitions and descriptions of social media's strange fauna. — by John Bucher