please answer all the parts of the question within 30 minutes in detailed manner. make sure the answer and reasons are explained in details else i will give negative ratings for sure.

BigData Analytics Inc. operates a business collecting data on consumer choices through social media, and then aggregates this data and sells it to advertisers. The company uses various surveys to glean information from participants. What law does BigData Analytics Inc. need to consider before collecting, aggregating, and selling the data from participants in the surveys on social media