As mentioned in a previous blog, you are currently limited to sending 10 recipients per app invite. Starting in the next few weeks we'll be beginning a trial run which will double the limit to 20 recipients per invite. This trial will last for two weeks at which time we'll closely be monitoring the effects for both developers and the end user experience. From the end user perspective, the recipient field will now auto scroll if more than 2 rows of invitees are passed in.

Please keep in mind that during this time all existing limitations related to app invites will still remain in effect. This includes the moratorium on app invite looping. We look forward to seeing the results.