If you are using a version of WordPress prior to 2.1 and you don’t have Prototype in your wp-includes/js directory, the little pop-up won’t show and you’ll be taken to the page instead. Make sure that the Prototype file is installed.

Also, the version of Prototype included in Share This 1.3 was incompatible with IE7, so make sure you get the version from the current release (or from WordPress).

If you are using WordPress 2.1 or greater and/or you do have the Prototype file included in your wp-includes/js/ directory, you may need to make sure the form is being added properly See notes on wp_footer in this document README.txt. Additionally check that other JavaScript on the page is not throwing errors.

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If the user is on a mobile device that has JavaScript enabled, he or she will see the widget as expected.

If the user does not have JavaScript enabled, they will not see the ShareThis button.

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