Dennis Skinner is trending on Twitter, thanks to an orchestrated campaign by Labour MPs to brand David Cameron as "ageist" for referring to the 80-year-old MP as a "dinosaur" at Prime Minister's Questions today. After answering Skinner's question about when he would appear before the Leveson Inquiry, Cameron then made the following joke: "It's good to see the honourable gentleman on such good form. I often say to my children, 'No need to go to the Natural History Museum to see a dinosaur. Come to the House of Commons at about half past twelve.'" (To read more, click here.)