Buttons are small squares usually 200x200 pixels and up. The small ones are designed to fit inside the sidebar of a blog. Just the right size for memes, too, including an image and a quote.
The most useful part of a button is its size. These little gems get your message across in a tiny space. Use them for blog hops, social media, on your blog's sidebar, Facebook parties, and more.
For longer messages, use a banner.
Make one for a blog hop or Facebook party and share with guests and fellow authors to advertise your event.