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Gmail, which is an excellent e-mail client, needed the social networking of facebook. twitter wants to have twit pick and all these other things you can do. the reality is i don't think any one social media site is going to serve all-purposes, all the time. no matter how hard they try. what i question -- and i question rachel is -- there's one phrase that people always talk about, never use with social media. what is the social "usefulness" of it all? >> are you serious? it's incredibly useful for exchanging information and sort of seeing trends. i mean -- and just for, frankly, for being soci...

Facebook. twitter wants to now have twit pink and other things you can do. the reality is i don't think any one social media site is going to serve all purposes all the time, no matter how hard they try. what i question and question rachel is, there was one phrase people talk about never use with social media, what is the social usefulness. >> are you serious? it's incredibly useful for exchanging information and sort of seeing trends. just for, frankly, for being social. it's an incredibly useful system of communication. it's changing everything. that's the short answer. >> i can see that. i ...