Obama had over a million e-mail subscribers during his campaign, he wasn't logging into a million e-mail accounts.
I have 11 e-mail addresses on 11 domains, but I only have to open one e-mail client to check them all.
Over the course of a week I suppose I log into 4 bank accounts, 5 financial sites, 5 forums, 7 servers via SSH, 11 e-mail accounts, 3 social news sites, 1 social bookmarking site, 2 social networks, 3 blogs... really don't need to write anything down to do that.
Why do you have to log into multiple bookmarking sites? Isn't the point of using one to put them all in one place you can access from any browser?