Nmap.org, home of the Nmap Security Scanner, has released Icons of the Web, a favicon-based visualization of the top one million sites on the web. Clearly visible in the image are both the WordPress.com icon and the Gravatar icon. The size of each icon in the image is proportional to the combined popularity of all top one million sites using that icon. WordPress.com comes in as the 8th most popular icon with 1,123 sites using it for a combined reach of 6.31%. Gravatar comes in as the 9th most popular icon with 650 sites using it for a combined reach of 5.03%.
How many of those icons visible do you use on a daily basis (besides WordPress, of course)?