While I appreciate independent developers trying to fill such gaps, I believe that making social apps (like picit) available as WP exclusive will not help us fill that gap or be part of the whole trend/experience. I still can't communicate/SnapChat with iPhone or Android users considerably limitting the audience for my picit activities.
Hope you will release an Android/iOS Version soon
EDIT: In regards to the screenshots: Don't iOS and Android suffer from the same issue? According to Wikipedia, you have to leave your finger on the touchscreen to show the image. Maybe you can implement that as well.
Thanks for your feedback. You do have a valid point, being WP exclusive will limit the audience. However, I am definitely thinking of porting Picit to e.g., Android The requirement that the user needs to hold a finger in contact with the display while viewing a picit could be added, but that alone cannot prevent screenshot capturing on WP8, as you can still easily invoke the required key combination.