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Foursquare & Swarm will work seamlessly with each other. I think you'll find that by giving things a bit more room to breath we're able to make all of these actions easier & better for you.

I use Google Maps with stars to do this. Try it out!

but by the sounds of it you'll still be able to do exactly that with 4sq.

It doesn't look like any functionality is being lost from the standalone 4sq app as it is now, just separated because people aren't using them together anyway.