Marco Polo App

Hi everyone. Last night at the weekly mandatory meeting here in my apartment complex, our new next-door neighbor mentioned a messaging app called Marco Polo, which he uses and would like to try out as a means of communicating with us. I vaguely remember hearing about it here on AppleVis awhile back, but my search only turned up 2 unrelated things. Is this app still around and if so, how accessible is it with VoiceOver? This new neighbor is very flexible, and told me that if Marco Polo won't work for me for whatever reason that's fine.