Twitter’s revenue and earnings for the second quarter have beaten expectations, but co-founder Jack Dorsey has said he’s not satisfied with its user growth. The Microblogging site posted revenue of 502 million dollars, up 61% year on year, leading its own top forecast, but active users reached 316 million in a period, up only slightly on the first quarter. Mr. Dorsey said the firm had to do more to realize its full potential. To the markets, and some strong corporate earnings as well as worst stability on Chinese markets, so the Wall Street lifted overnight. The Dow gained 190 points. The Nasdaq was up 49 points. Well, the S&P 500 was up one and a quarter percent. In London, the FTSE was up 0.8%. Checking commodity prices, West Texas Crude is trading at 48 US dollars a barrel. Tapis Crude is at 57 US dollars a barrel. And gold is trading at 1095 US dollars an ounce. The Australian dollar is buying 73 US cents, 66 euro cents and 47 pence sterling.