I have new problem and this problem is:
1- If the article has NO image, its showing the last auto published article image to my Facebook.
1- I use publishing post to my Facebook as Facebook Link.
2- I use my Own APP.
3- This happens with my own APP or your APP.
4-In option>>General settings Tab>>Default image I choose my Image.
Example for article has no image but Post show Wrong Image
If you use the channel type "FacebookLink", AutoTweet posts the link only and the other values are taken from the metadata of the page URL given in the link parameter. When Facebook visits the link, it looks for Open Graph Metadata which your site may or may not provide!
So the default image is not used in this case.
See also here for information about what Facebook does in this case and about Open Graph meta tags: