This column brings you the most interesting and useful business and financial commentary on the world of technology every day. GigaOM Link: Snapchat Rises: Why Poke's Decline Shows Facebook's Inability to Invent Remember last week? You know the week when Facebook (NASDAQ:FB) indulged in yet another act of wanton xeroxing and released Poke to compete with the red-hot insta-communication app Snapchat. Well a week later the world has returned to normal. Snapchat the insta-sharing app is once again among the most popular apps — at third place.   And Poke…well it’s languishing at the 34th spot on the top ...