ALT tag? What do you mean? I don’t understand.
My thought was about automatic generating the Open Graph meta tags, eg:
<meta property="og:title" content="Title of a webpage">
<meta property="og:description" content="Description of a web page">
<meta property="og:site_name" content="Name of the website">
<meta property="og:locale" content="en_EN(and so on)">
<meta property="og:url" content="http(s)://website-address/name-of-the-file.html(php)">
<meta property="og:type" content="website">
There is also more Open Graph tags, but they above would be enough for the Facebook or Twitter. Images will be choosed automatically by the Facebook or Twitter crawler while publishing a link to a webpage on social media.
What do you think? As I can see, every necessary information needed to generate those tags are filled in the Sitecake - Page Details dialogue window. Only the Website Name (og:site_name) is missing.
All of that is only my question/suggestion about improving the Sitecake capabilities …