Facebook link thumbnail
问题 When posting a link to a website in Facebook (Google+ and the rest count too) you're given a thumbnail, or selection of thumbnails to choose from. These are tags from the HTML. I've always been of the opinion that it was good practice to make my logo a background image inside a h1 tag using CSS. I make the h1 tag a link back to the home page and hide the header text with something like {text-indent: -9999px}, leaving a lovely semantic HTML header. Here's a link to my site if you want a look: