Social networking sites are sites that you can use to build social network through the internet.
In other words, you can use these sites to keep in touch with your family, students and friends

(...and enemies

...hee hee) online. The most familiar example of social networking site is
Facebook. Through Facebook, you can connect yourselves with anybody and do many interesting activities with them, such as showing off your photos and seeing others', give and receive comments on the Facebook's wall, chat with them online, etc.
There are lots of social networking sites available in the internet besides Facebook.
Friendster used to be popular among people in Asia, including Indonesia, before they switched to Facebook.
My Space is used among many people in Australia.
Twitter is as popular as Facebook all over the world. You could read a comprehensive list of social networking site all over the world in
Wikipedia.
I prefer using
Multiply than Facebook, Friendster, or Twitter because the features of Multiply can be exploited for educational purposes. Please download my slides
here and read them again to find out how you could use the blog, picture, video, review and link pages in Multiply to support the course (TEYL) I'm teaching at Unesa.
The assignment for the topic 'social networking sites' is: use Multiply to support a course you're teaching at school.

Create a multiply account in http://multiply.com.


Select a topic for your Multiply that you could share with your students, e.g. English, reading, grammar, etc.

Post some items in the
blogs, photos, notes and
external links.

Submit the address of your Multiply (e.g. gendolos.multiply.com) and the email address you use to open the account.

If possible, please invite me to be a member of your multiply site. Mine is htpp://shirtnjeans.multiply.com.
Good luck!