Is it worth making a web application that users will only use once....? They will get comments on there own wall from friends of course and thus there friends might use it and so on, however its still a one time use idea. On a side note, can I place google ads on my app ?
that you need to decide wrt the apps time / and worth from that apps . check this note from fb site abt adsense http://www.facebook.com/note.php?note_id=71565718883