The Digital Inspiration weblog has a step-by-step for adding HTML to Gmail messages. For those of you who have tried inserting an image or table in Gmail, you've probably noticed that Gmail won't ...

When inserting your text or code for the custom tab, you can define different content to display to visitors, depending on whether they “like” your page.

To add links to your Tumblr bio, you'll need to use a simple HTML code, which you can copy and paste in quickly.