I think for iOS doing Game Center is always a plus. Most people know what GC is.
Facebook though is where everyone is. If you’re going to do an app that is also on Android, Facebook would probably be the network of choice.
As for Openfeint. I’ve really not seen a lot of use when my apps used it. In fact when I was having some test my app, I got multiple responses like “I didn’t know what that OpenFeint thing was so I skipped it.”
OF gives us nice features like not having to build FB and Twitter into our own apps and it will intergrate with GC and it’s available on Android, so there are a lot of pluses. I just have concern about app owners being asked to login and provide all this info without knowing what it is.
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