Postcards are shared with everyone by default. However if the postcard is edited by someone else the "to" fields can be reset if that person has not exchanged identities. (Then again this maybe solved by editing only your own postcards but would be good to fix)
Also note that contacts will now be refreshed on Editor page after an Identity Exchange (see issue #74) and therefore user selection information will need retained after reloading DOM option elements.
Postcards are shared with everyone by default. However if the postcard is edited by someone else the "to" fields can be reset if that person has not exchanged identities. (Then again this maybe solved by editing only your own postcards but would be good to fix)