I've section hiked the southern third of the Trail, primarily in winter and almost always solo. It's nearly impossible to find someone who hikes the same speed as yourself, finds the same views worth slowing down for, likes the same brand of whiskey, wants to take a "zero" or "nero" day sometimes, wants to hike late into the evening or go naked night hiking (weather permitting), etc. Being somewhat schizophrenic, I make pretty good company for myself.