I've written various posts on the topic of friendship in recent weeks, and with good reason. Friendships constitute an integral part of our lives, and, let's be honest -- it doesn't get any easier to make new friends or attend to the ones we already have as we get older and busier. Still, with a little time and effort, we can continue to forge new friendships while maintaining existing ones. Here are two ways to help facilitate this: 1. Zero in on commonalities, but express interest in other aspects of the person's life as well.  If you're like me, you share different interests with different friends. Maybe you have a health-conscious buddy with whom you dine and hit the gym, a fellow sports-loving friend who accompanies you to ballgames, and a friend from high school whom you occasionally visit at home to catch up. Whether it's a friend who haven't spoken to in a while or someone you've just met who seems to have "friendship" potenti...