I truly believe that it's about the quality, rather than quantity. Having conversations with others that you can connect with is invaluable. The problem for me is not making the connection, but maintaining it. Either my expectations are too high, and I'm too picky; they're just too shallow, or a combination of both. My approach is usually not to look for friends, but look to be a friend, and this calls for flexibility.
I had recently commented on another post here regarding how shallow it is to ask a new acquaintance what they do for a living, as if that is some telling aspect of their value. I noted that I tend to ask people what they're passionate about, and how difficult the question is for some to answer. Though I find it's very easy to answer for those I'm going to be inclined to connect with and subsequently be able to maintain that connection. I don't really care what you're passionate about, though, it need not be a commonality between us, just that there is something you enjoy so much you consider it to be a passion. Maybe it's even more productive for me when it's not a commonality, as I love to learn about new things and someone whose passionate about something I'm not so familiar with leaves a lot of room for learning.