I\'ve seen a similar question asked a few times, but usually it is from people trying to find out which Page is currently accessing their Tab app. (Which you can do by inspecti
In the general case, 'no', without keeping track on your side via the signed_request
but if you're already obtaining manage_pages
access from the user it's pretty trivial to check if a particular app (i.e, yours) is installed on the page
See the page documentation for details, relevant part:
You can test if a specific app is installed on a page profile tab by issuing an
HTTP GET to PAGE_ID/tabs/APP_ID. If the app is installed, this will return the
following fields:
(you'll need the page access token from the user's /accounts
connection for that call
To be complete (for future readers): this does not require manage_pages
. You can also use the FB app's token. Also see: Check if page tab app is still installed