Jim Cramer said he's 'thrilled' about Twitter's (TWTR) appointment of Jack Dorsey and CEO, saying he can end the turmoil at the company. A viewer wanted to know if the appointment changes anything for the stock, and Cramer said it does. Cramer said Dorsey is a 'stabilization force' who cares about Twitter's shareholders, workers and Tweeters. Cramer was also asked whether he's still a big fan of Verifone (PAY), and he replied that it's still a good opportunity. Another viewer wanted to know if Whole Foods'(WFM) stock is a buy. Cramer said he doesn't think the company should be public and it's worth more than people realize, but he does think Whole Foods is going to have a bad quarter. One viewer asked whether he should continue to hold stock of Celgene (CELG) if it runs up ahead of earnings. Cramer said Celgene is an incredibly cheap stock and he likes it. Cramer was asked about Diamond Offshore(DO) and whether it's time to buy the shares. Cramer said if you think we've hit a bottom on energy prices, there are so many other stocks to buy including Occidental Petroleum (OXY), Schlumberger (SLB) and Halliburton (HAL). He also pointed out that TheStreet’s in-house technical analyst Bruce Kamich is saying Halliburton is a buy. Finally, one viewer wanted to know Cramer's opinion on Moody's Corporation (MCO). Send your questions to Cramer using social media. On Twitter, send your questions to @JimCramer, using #CramerQ. You can also find him on Facebook(FB) at Jim Cramer.