DUBMeNow is a snazzy little application for BlackBerry, iPhone and Android that came out awhile ago whose key feature was to automatically update your native address book whenever information changes – phone, e-mail, address, you name it. The catch, of course, was that both people needed to be registered users in order for the exchange to happen. An update released today includes GPS integration as well as a whole batch of social network support that may very well help convince the skeptical to install the mobile app. A new “locate” feature finds where you and your potential business card swap-ee are situated, and automatically prompts both to make the switch. You can also tweet who you’re meeting, send LinkedIn requests, and keep tabs on their Facebook account. While I still find the process a little more convoluted than, say, contxts, or even QR codes, but I’ll probably keep the new DUBMeNow app arhived on my Bold on the off-chance that folks I meet at trade shows are already signed up. If you happen to shake a lot of hands in your line of business, check it out in the BlackBerry App World, iPhone App Store, or Android Market.