Personal information was known , so with the result various damages is considered.
If mail address is known to someone, maybe there are junk mail being send to you everyday.
If address or telephone number is known to someone, maybe a stranger wander around your house and maybe you have a lot of crack calls.
If ID or password of auction sites or Internet shopping sites is known to someone, maybe a goods is made a bit or order for without permission.
Maybe pretend to be oneself.
If credit card number in conjunction with address is known to someone, maybe unfair use credit card.
By a personal date leak, you may be caught up in a crime and there is a case of suffer big damage.
Therefor you should manage personal information steadily.
▲To prevent flowing out of private information, be careful.