How can I keep my address book from being hacked?

What information do you keep in your address book?

• Hi, I am embarking on a project to learn web development coding, and i have come up with an idea for a univeral online address book. All i want to know is what sort of information would you like to keep on a perticular person in an address book. For example i keep: Name (First, Middle, Last) DOB Telephone Numbers Emails Web Addreses Postal Addereses Notes

• Answer:

  I do not know about others, but I do not think it wise for anyone to put a date of birth on the internet, whether it is their own, or especially if it belongs to someone else. What if an intruder gets control of the computer ? I wonder what the online Address Book has to do with Web Development coding, which is complicated in itself. Good luck