Check out http://pagefreezer.com, it is a cloud solution that captures everything online: RSS, websites, blogs, forums and social media.
PageFreezer captures changes on your website in real-time – so you won't miss any intra-day change – and is able to accurately replay and browse any archived RSS/website/blog/social media. It provides features to jump through time using a timeline or full-text search all archived data. PageFreezer archives online assets in a way that it complies with industry regulations (SEC, FINRA, FDA, SOX) and litigation requirements (FRE 901).
PageFreezer is currently in use by a broad range of Fortune 500 companies (Finance, Pharma, Food, Retail, Technology) and government agencies.