Primitive data types include integers, reals, Booleans, strings, and dates/times. Integers represent whole numbers and can be positive or negative. Reals also represent numbers but can include decimal places. Booleans represent true/false values. Strings store alphanumeric characters. Dates/times capture dates and times in different formats. A social networking website would likely use strings to store user names and posts. It would also use dates/times to time stamp posts and Booleans for features like online status. Integers could track numbers of friends or likes.