Wow! A lot of food for though here! Thanks noodle!
The main problem with the Facebook application is that we would need to require a login and, since there are several facebook apps which does the same that currently Wolpy does, it would be a handicap for us.
By the way, I owe you an email about the FS offer!
Yes, I should work on that idea of letting the people try the app before singing up.
For sharing their map users have the option to embed it in their websites and blogs. There are two versions of the map: an interactive one (with Google Maps, which can be zoomed in) and a static image (which can be embed in places which doesn't support iframes, like Myspace or Flickr profile).
Letting the people to create their map before signing up is an option we take into consideration but finally dismissed. Perhaps it's time to rethink about it.
The mobile integration sounds great! We had thought about making an iPhone app in the future but I think that there are more mobility options to explore.
You're right about showing the photos of the people who have visited a place. It's great for places with a few visitors but it becomes too much information for much visited places. We are going to remove that ajax for the next version but I think we should keep looking for an information design which would fit both cases.
The main problem with the Facebook application is that we would need to require a login and, since there are several facebook apps which does the same that currently Wolpy does, it would be a handicap for us.
By the way, I owe you an email about the FS offer!