re checking email/lj etc on different devices. I have that urge too. I think it's something very primaeval: You look for nuts under a nut tree and find a nut, then you arrive at a different nut tree, time to look for another nut. There are studies on birds and searching and, quite sensibly, once they've found food in one place they'll go and look in another place for more. Though after enough time has elapsed they will look in the first place again (if that's had success there).

So I think the wanting to check for more goodies on a different device is a historic foraging thing that's wired into us... Just a bit inappropriate....