Works great. Suggestion for future version.
A switch selection in admincp options that say
1) First Image
2) Provide Array
1) First Image is exactly as this mod acts.
2) Provide Array - would take all IMG and ATTACH in first post, and convert them all to
<meta property="og:image" content="http://example.com/image1.jpg" />
<meta property="og:image" content="http://example.com/image2.jpg" />
that way, when a thread is posted it will give you the option to choose the pic.
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