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“Press This” is the reblog bookmarklet for Wordpress. It allows users to reblog content from any site to wordpress. Watch the movie (min 0:44) to see it in action:

Zemanta Reblog allows user to reblog content from blogs, which have the reblog feature installed to any supported blog software. At the moment zemanta supports blogspot, typepad and wordpress blogs as target applications.

Share This can be used like the Zemanta Reblog feature directly on several applications or as Browser Plugin. The user can reuse the selected content and/or the focused paged via pressing the share this button on several social web applications (e.g. facebook, digg, wordpress and so on).

Limitations:
All three tools copy the values of the data to share from one application to another. That means they create new resources via using the APIs of the applications and copy the values into the newly created resource skeletons. The origin of the newly created source is exposed in form of a normal link. That means that it is only understandable for humans what is the original source of the content.

All three tools only allow the user to reuse content in general, but without being able to influence how the selected content is reused, i.e. how it is related with the content of the target application.