I usually run with my friend Zach. (he runs shod) We went to HS together. When we're done I head to the Museum School, he heads to Harvard Law School. (he's 1st year)
I run alone unless someone else runs with me, then I run with someone else.
I run alone because it's hard for me to find someone that will run my pace, my distance, and on my time (I'm really quite selfish).