Website using the £ symbol on their website - meaning it may accept payment in this British currency.
Facebook's Like button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content on the web and share them on Facebook. You can also display a Share button next to the Like button to let people add a personal message and customize who they share with.
Open graph description entity tag
Sites who has this tag are verfied by google to use WebMaster tools