You can't create spots for the other services, you can only create ZapLoc's from existing spots.

At least... not yet (and I'm not sure I plan to do that - don't hold your breath for that feature any time soon)

For now:

• For gowalla, use http://m.gowalla.com
• For foursquare, use http://www.cotchin.com/m/
• I don't know about facebook, sadly, touch.facebook.com used to sort-of work, but now they broke it

/Z