I usually check Skype first due to the fact my best friend REFUSES to switch over to Discord. I'll never understand him.
Anyway, I check Discord next and then lurk around on a few forums.
Same, my email notifications on my phone are the first thing that I look at. Then usually any other notifs on my phone. Then if my morning routine has time for coffee by the computer, I open my other emails there, then FB, Iwaku, and Discord in order depending on if I expect something to have happened or not.My notifications on the lock screen, or in the bar! Then depending what catches my attention the fastest it is either Discord or my email.