While people enjoy the convenience brought by more and more technological developments, its importance is also more widely known. Big data and cloud computing are the two most typical representatives of many new information technologies, and their combination is also the general trend. But big data will also have privacy and security issues in cloud computing. Displayed security mechanisms and implicit security mechanisms are the two main directions for discussion, so that user privacy and security can be in the big data that it is well guaranteed when processing the calculations and storage. The rapid development of social media has been widely used, but it has also brought new social problems, such as the increasing difficulty of verifying the authenticity of information. This article will discuss the influence of the credibility of social media on the credibility of social media from the perspectives of the credibility of the communicator and the information media, the quality of the information, the reason for the transmission, and the form of expression. The influence on information credibility and information quality is the relationship between information credibility and other influencing factors when trust tendency and information involvement have become moderating variables.