I SUSPECT A half dozen avid users of Foursqaure in Dublin are clever drive-by check-in artists. That's because they often check in while "off the grid" several times an hour. Then they emerge from silent running with more than 200 points for an hour of drive-by Foursquaring. It's just a game but because it's relatively easy to spoof movements, I'm left wondering how many "tips" or special offers are vacuous as well. Not so with Google Latitude. As the screenshot from my phone shows, you can see your friends on Latitude and even get turn-by-turn navigation to where they're positioned. More than any other application onmy creaking Nokia E90, Latitude finds things faster, marks things across its system and onto Ovi maps, and lets me tweet through short status updates. But it sure ain't a swish app store item so many of my friends have never used it.