Great examples from you all! Data from social media are certainly called big data. And we have seen that the companies have been utilizing their data very well, in terms of business. For example, they use machine learning technique to provide suggested pages related to your interests. In healthcare, EMRs from HIS can also be considered as big data. One of challenges of utilizing EMR from HIS is that data from EMRs consist of both structured and unstructured data (scanned doctor note, radiology images, etc). It’s difficult for conventional statistical methods to analyze these data.