Hi studioinsight,
I check at this link http://www.agostinosella.it/twitter.html and does not see any images.
On JA Social Feed plugin, you will see there are two options for images. Hover on the label you will see the description like this.
1. ‘Use Image’
=> If Yes, the plugin will automatically extract image from the Url that user shared in Twitter then add it into Joomla articles for displaying. Otherwise, it will import text only.
2. ‘Save Image’
=> Choose to save images into your site. If not, the article will use the original images from source site.
If you do not want to import any image. Then please set ‘Use Image’ as ‘No’. Please make sure that you did delete the previous imported articles and then import again.
If you have any other question, just let me know.
Regards