The iPod touch is often viewed as the de facto replacement for the iPod line, which, despite owning 70 percent or more of the mobile music player market since early this decade, has started to show signs of decline . However, the iPod touch is serving an even more strategic role in popularizing the iPhone OS platform with a younger generation obsessed with social networking and gaming. When the …

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iPod touch is gateway drug to iPhone for Facebook generation (Ars Technica)