Jan 25 (Reuters) - The following are the top stories in the Wall Street Journal. Reuters has not verified these stories and does not vouch for their accuracy.
- Twitter Inc Chief Executive Jack Dorsey is revamping his top ranks as he tries to find ways to revive the social media company and earn the trust of investors. (http://on.wsj.com/1RHubsr)
- U.S. health inspectors have found serious deficiencies at Theranos Inc's laboratory in Northern California, according to people familiar with the matter. (http://on.wsj.com/1RHGjtC)
- Johnson Controls Inc and Tyco International PLC are in advanced talks to combine, according to people familiar with the matter, in a deal that could value Tyco as high as $20 billion and signal that companies are still willing to embark on large mergers despite being shaken by recent market volatility. (http://on.wsj.com/1QsUkda)
- Canada's efforts to curb greenhouse gas emissions are calling into question oil majors' ability to tap the world's third-largest oil reserves. (http://on.wsj.com/1OQkSk3) (Compiled by Aurindom Mukherjee in Bengaluru)