Context menu item that plurks the current page-if text is selected provides a menu item to search plurks for the textNice minimalistic add-on that adds a context menu to share a page on plurk.com If text on the web page is selected, it then adds a context menu to search plurk posts for the selected text.
To see the code for this add-on go to: http://timothytocci.com/2012/07/29/plurk-it-a-simple-google-chrome-extension-for-using-plurk-com/