You can refine your search using the tools on the right-hand side of the page.

ENGADGET: Facebook launching 'Graph Search' personalized social search engine, beta starts today (video)

In the case of Merriam-Webster, the free version comes with yakking editor video feature over on the right-hand side of the page.

FORBES: Merriam-Webster Tries To Climb The Freemium Wall

If you have any questions or queries, please visit "Contact us" (link on the top right-hand side of this page) to get in touch.

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Click on the link below to go to the next part of the tour, or choose a section from the complete tour on the right-hand side of the page.

BBC: SPORT | 606 | Writing match articles

Susan Watts' film was screened on Monday, 6 December, 2004, but you can watch it again by clicking on the link at the top right-hand side of this page.

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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.

FORBES: How Facebook Can Be a $100 Billion Business

You will find other useful links on the right hand side of this page - including one for The Giving Campaign, an independent, national campaign supported by the voluntary sector and the government that was established to increase the amount of money given to UK charities.

BBC: Finding cash for playgroups