1.19.1:
    Added dummy-button for facebook

1.19: Changed twitter link to reflect API change, fixed rel=nofollow

1.18: Added spread.ly (experimental)

1.17: Added identi.ca

latest: Smarty3 forward compatibility

1.16:
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Added extra "do not track me" security when using facebook like button. Must be enabled in the plugin configuration.

1.14:
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Added Facebook "like" iframe
