I was immensely skeptical of the social network Samsung created for Note users when I first heard about it. I had no plans to get into it, nary a thought that it might in fact be my very own digital smack. Pen.UP is GREAT. I love that my Note lets me be creative and artistic on the go. I love the tools it puts in my hands wherever I am. And apparently, there are piles of other people out there who feel the same. Pen.UP puts all those people in…