They have embed codes to add it as a form on your website or Facebook page tab, they have a cool countdown widget that you can see in action on my site in the sidebar.

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But the most dizzying aspect of Wikipedia is that anyone can create or change an entry by clicking on the "edit this page" tab and typing away.

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Borders has created a dedicated eReading tab on its newly revamped Facebook page.

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If you would like to respond to this story, please click on the Comments tab at the top of the page.

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If you want to have some alternate content, why not make it a tab at the top of the ESPN page?

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They include a small ad tab at the bottom of pages and full-page interstitials.

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Candidates drawn to the page through ads, organic referrals or their own search then click on the tab to browse available jobs.

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Each time you toggled to a new tab, the ads on the right-hand side refreshed meaning a new page view and ka-ching for Facebook.

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