I find very few folks are watching their Facebook feed, some are watching their Twitter feed, and all of them are watching their email box. So, while social networks are nice, email is still the killer application.
The dynamic with social is you tend not to have products with 30% market share. It's all or nothing. Email works because we have open standards that let you communicate across any email client.
Checking email every 45 seconds is not only compulsive, it's presumptuous. It suggests a belief that anyone who sends us a message needs us to read it immediately, even if the message is from SkyMall telling us our Bigfoot Garden Yeti statue has shipped.
The 'sent' folder of my email program is really my biggest inspiration and my biggest source of lyrics. That's where I go to pick up a lot of the lyrics that I'm writing.
When email and the Internet came along, I never publish an email address. I just stuck with this P.O. Box address.
I've been using email since 1983. I started with MH and Rmail, then cc:Mail, then Microsoft Mail, with Compuserve mixed in. Eventually, I ended up using Pine for non-Windows stuff and Outlook for Windows stuff. For a while.
We all think Al Gore invented email so we could save time and save paper, to save trees. And that includes phone trees.