In regards to keeping in touch, it is a comfort level thing. I myself am comfortable falling off the map, because I value my comfort over my relationships with other people. If they dont match up at least mostly, it wouldnt bother me to go without contacting them for days, maybe a couple weeks. All of my close friends are the same way. I could be off the radar for months and then suddenly show up as if nothing happened and all parties would be cool with that.
But if I were trying to develop a deeper relationship with someone, yeah, I would feel guilty for not keeping in touch at least every couple of days. Though at this stage, that is at odds with my level of comfort. If I contact them enough, I worry that they will notice that I am interested in them, and either answer they give would make me nervous.