Information on more than 120 million American households was sitting in a massive database found left exposed on the web earlier this month, Forbes has been told. It included an extraordinary range of personal details on residents, including addresses, ethnicity, interests and hobbies, income, right down to what kind of mortgage the house was under and how many children lived at the property. In total, there were 248 different data fields for each household, according to the researcher who uncovered the leak data this week.