Two companies from completely different areas of the tech world today squashed rumors that they are for sale. The CEO of Advanced Micro Devices (AMD), the second largest CPU supplier, and the new CEO of Twitter, a microblogging social network, have made statements emphasizing that their corresponding company is not for sale.

"AMD is not for sale, but we are happy to listen to any proposal which is in the interest to our shareholders," AMD CEO Dirk Meyer told an industry conference in Barcelona and was quoted by Reuters. Oracle CEO Larry Ellison said last month his firm is keen to make more acquisitions and a microchip company could be a good fit. The result was rabid speculation that AMD was at the top of Oracle's list.

"We have a truck-load of work ahead of us but we have no plans to sell out and think of Twitter as being a communications platform for a long time to come," Twitter CEO Dick Costolo told The Telegraph. Earlier this week, Costolo was promoted from chief operating officer to chief executive officer, taking over the role from Evan Williams, whose job title is now co-founder. Speculation that Twitter was up for sale came with Costolo's appointment, who has previously sold two companies: Feedburner, an RSS platform which he sold to Google in 2007, and SpyOnIt, a web page monitoring service he sold to 724 Solutions in 2000.