Facebook users were today left contemplating the security of private details stored on the social networking site after part of its source code leaked onto the internet.The site today acknowledged that a section of its code had been copied and published on a blog, but stressed that none of the personal details of its 52 million users had been compromised.At the weekend, a blog called Facebook Secrets published details of part of Facebook’s ‘source codehttp://technology.timesonline.co.uk/tol/news/tech_and_web/article2252057.ece