If disable image publishing in Media mode and use only [Status Message Only] Share option appear normally.
Before Facebook share option was displaying with no problem in my page.
Facebook share option not displaying
Would you please advise me?
1- I'm using my own app.
2- When Authorize application the application page keep refreshing and not showing the Access Token user/page
3- This only happens if I use my app but not yours.
4- This happens few days ago but not before.
Also you should do a test, if you can use the AutoTweet channel "FacebookLink". With this channel the share button is displayed but the layout and behavoir does not work in all use cases.
Regarding your app: Please check the options of your app (especially the "offline_access" migration option) and check the Canvas URL in AutoTweet channel dialog (Check that you use "https" and that there is a "/" at the end of the URL).