Giovanni Rodriguez contends that many our social media tools are DIY versions of things we already have:
Blogs = publishing
Podcasts = radio
YouTube = TV broadcast
Social networks = community centres
I agree. And I’d like to add that I think Twitter is a souped up version of the old fashioned telegram. They’re immediate, pithy (though not due to cost), include funny abbreviations we’ve come to accept and are written with limited punctuation.
One difference – there’s no uniformed delivery boy.