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Your job is catch up with it. >> reporter: 18 months later, instagram had 30 million use zers. among them, big names who fell in love withhe platform. as the company was growing, before you sold it to cebook, who were the craziest celebrities who joined instagram. you are like, oh, my god, that person is using it. >> the first was snoop dogg. >> snoop was the first? >> he really joined early around, you know, i think -- >> it matters. he makes it cool. stamp of approval and people flow in behind...