I just got back from attending the most amazing IBM Redbooks social media residency on Mobile Enterprise, where I spent a week face-to-face with colleagues from across IBM to discuss mobile computing, and an interesting thing happened on my way home today. I got to the airport well before my boarding time, so I had some time to kill. I found a comfortable place to sit near my gate, and pulled out my smartphone to check emails, read news - catch up with the rest of my life, basically. I looked at Facebook to see what my friends were doing, and noticed that an old acquaintance, Margaret, who I hadn't seen in a while, posted an update to her wall saying that she would be in Pittsburgh (where I was heading) and asked if any of her friends there would like to meet up and hang out while she was in town. As I read it, I admitted to myself with a pinch of regret that I had lost touch with this person. I didn't even know that she moved away from Pittsburgh. Several y...