Loopt allows you to see where your friends are at any given moment. On one hand, it could encourage a little bit of stalking, but on the other, as a Loopt user you can control how much information your friends see — and if you don't want them to know where you are, don't post an update.
That said, I'm into Loopt's latest update to its iPhone application. It allows you to enter a tip for any place, whether you're checked in to the location or not. Have a favorite dish at a restaurant? Is there a secret menu item everyone should know about? Is your hairdresser the best at her salon? Just use the "Leave a Public Tip" option on the location's page to tell your friends (and everyone else) exactly what you think.
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