I am a frequent user of Skype, and I have realised that when you paste a link into Skype im using the desktop app for this like example YouTube, the thumbnail is displayed in the chat.
So I was wondering if there is a specific type of class or area I need to make in my code, be CSS or PHP so that the Skype Spiders (if exist) pick up the image, and display it in the chat. - Being this is a commercially allowed thing to add to your site.
I have looked at the Skype Developers area on the site and on the Microsoft site, and there was no information regarding on my topic.
Skype, Facebook, and others are using Open Graph Protocol to get those. You can find more information about Open Graph Protocol online and a small code to achieve it is:
<meta property="og:image" content="/image.jpg"/>
<meta property="og:image:secure_url" content="https://mywebsite.com/image.jpg" />
These two should be present in your <head /> tag. Also make sure you add the XML NameSpace to the <html> tag:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:og="http://ogp.me/ns#"
xmlns:fb="https://www.facebook.com/2008/fbml">
You can also use multiple images, you just need to add multiple image meta tags in the order you want them to appear in. The user will then be presented with an image selector dialog in Facebook.