Facebook applications are the new thing these days, and those (annoying) Quiz applications hold the largest percentage of all applications available out there. But you hardly see any of these applications which have some real value, until now that is.

Mozilla’s Security Quiz is the first Facebook quiz application that actually does something useful. The application asks the user five basic questions about Internet Security, and ranks your knowledge based on them. Interestingly, the application also serves as a security and privacy guideline for developers who design quiz applications because this app doesn’t ask for or store any personal information on your Facebook profile – not even your name.

Heard about Twitter but still don’t have a clue what it is and what’s its value for your business? Well the Twitter team has answered both your questions with their new Twitter101 guide. The guide covers the basics of Twitter from its lingo to its value as an effective communication medium to strengthen relationships with your customers and consumers.

A lot of web based screencast services have sprouted recently. That’s not because there is a lack of good desktop screencasting applications – its because of usability. Web Services don’t need to be installed and are usually quite straight forward to use.

That said, ScreenCastle is one such service, that gives you an overdose of usability. It lets you record and upload screencasts with just one click! You don’t even need to sign up and create an account. What’s the catch? continue reading.

Ever wanted the Facial Recognition technology used by the FBI at your finger tips? Well that dream is a little hard to satisfy, but what I can give you is Face.com’s Photo Finder – a Facial Recognition tool for Facebook.

Photo Finder uses advanced Facial Recognition algorithms and existing Facebook photos and tags to identify you and your friends around Facebook. The technology, though not as powerful as you see in the movies, is quite neat and works out great most of the time.

Just when you thought that no one else would be stupid enough to make another twitter app that lets you post your RSS feed to your time line, along comes TweetMyFeed. TweetMyFeed is yet another humble attempt at something which other services, TwitterFeed for instance are doing perfectly.