But Facebook went further than other sites, in some cases signaling which user name or ID was clicking on the ad as well as the user name or ID of the page being viewed.

WSJ: Facebook, MySpace Confront Privacy Loophole

These are generated by employees who use their business address as part of their user name.

FORBES: Finance Firms are Going to Twitter and Social Media With Mixed Results

All you have to do now is hit the publish button and your pics will be displayed online using your user name as an extension after bigpicturelibrary.com.

BBC: The Big Picture Library

In either case, NSI recognizes the user as the direct owner of the domain name, which can be used to establish a company's online brand through URLs and e-mail addresses.

CNN: New domain name system creates confusion over ownership

"The attacker would be acting as a proxy and be able to see your user name and password, " said Mr Mutton.

BBC: Are secure websites still safe?

When a user types in a keyword, such as a surname or a place name, Mocavo searches genealogy Web forums, websites and old discussion threads that rarely pop up in regular searches but can be useful for genealogists looking for clues.

WSJ: Using Wikis and Other Forms of Group Research, Family Historians Are Making Surprising Connections

ThisLife saves photos posted by its users as well as photos from other people in which the user was tagged, or identified by name.

WSJ: A Hangout for All Your Social-Network Photos

The name Dark Patterns itself (what hacker-types might think of as black-hat user experience) names and helps shine a light on a previously murky area.

FORBES: Connect

Wells Fargo looks at multiple factors to authenticate users including name and password, a token in some cases, behavior such as the IP address the user comes in from and what he wants to do.

FORBES: Wells Fargo Goes DIY In Building Business Banking Services