I don't imagine sniffies, a4a, MH, bbrts (for anyone reading, please don't look these up while at work... or at least not on a work computer... these are all Gay hookup sites) is any better. Particularly the first one when it comes to location data considering it just legit shows a map if people.
I really don't trust any of them (App or Website), enough so I have seriously contemplated getting an iPod touch or something and tethering anytime I want to use them. But I have not quite gone that far yet.
There are certain conveniences the apps get you.