This is a big duh to anyone (like me) who's switched to a smartphone within the last year or so, but according to "new research" (I've never heard of them either), social networking applications and websites are blowing up on mobile phones, including none other than the iPhone.
Things are going both ways -- social networks are reaching out to mobile users with mobile versions of their sites and device-specific applications, and mobile phones are reaching back by allowing quick and easy ways to take pictures or upload text or video. That dude on his phone in the bar next to you is just as likely to be texting his entire network as he is texting that friend he's waiting for.
The end of The Guardian's article about this notes that search is up on mobile phones, too. Throw one more tick on the list of ways the iPhone has influenced how, when, and where we're using the Internet on our phones.