Grazie per la risposta
Ho anche modificato "pen Graph article image" nelle proprietà del plugin "Fast Social Share"
come "Full Article Image"
ora va meglio
viene presa l'immagine desiderata
il problema è che è grande
e non viene ridimensionata
inoltre il debugger
https://developers.facebook.com/tools/debug/sharing/?q=http%3A%2F%2Fwww.marathonclubtrento.com%2Fpublic_html%2Findex.php%2Fm_corri-da-zeromi da diversi errori:
Admins And App ID Missing[/size][/font][/color]
[/size]fb:admins and fb:app_id tags are missing. These tags are necessary for Facebook to render a News Feed story that generates a high click-through rate.[/size]
[/size][/color]Like Button Tag Missing[/color]og:title is missing. The og:title meta tag is necessary for Facebook to render a News Feed story that generates a high click-through rate.
[/size][/color]Like Button Tag Missing[/color]og:type is missing. The og:type meta tag is necessary for Facebook to render a News Feed story that generates a high click-through rate.
[/size][/color]Like Button Tag Missing[/color]og:image is missing. The og:image meta tag is necessary for Facebook to render a News Feed story that generates a high click-through rate.
[/size][/color]Inferred Property[/color]The 'og:url' property should be explicitly provided, even if a value can be inferred from other tags.
[/size][/color]Inferred Property[/color]The 'og:title' property should be explicitly provided, even if a value can be inferred from other tags.
[/size][/color]Inferred Property[/color]The 'og:description' property should be explicitly provided, even if a value can be inferred from other tags.
[/size][/color]Inferred Property[/color]The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags.
[/size][/color]Share App ID Missing[/color]The 'fb:app_id' property should be explicitly provided, Specify the app ID so that stories shared to Facebook will be properly attributed to the app. Alternatively, app_id can be set in url when open the share dialog.
[/size][/color]Proprietà dedotta[/color]La proprietà "og:image" dovrebbe essere fornita in modo esplicito, anche se è possibile dedurre un valore da altri tag.