Thomson Reuters has launched Calais Tagaroo – an application for WordPress, which allows bloggers to semantically tag their content.

The plugin app automatically generates tags for people, places, facts and events, according to a release from the company, as well as finding relevant photos from Flickr to accompany posts.

Bloggers can add their own metatags too and set filters for image searches on Flickr. More tag categories will be added as the application is developed.
The plugin, which is freely available as part of the Open Calais project, is aimed at optimising blog posts for search engines.