Babbel is a social networking vocabulary building website. This is one of the best websites I have seen to increase your vocabulary. Why not learn a new language from people who are passionate about it? Learn German, French, Italian or Spanish by connecting to others online who want to learn with you.

The best part of the website are the interactive multimedia vocabulary building exercises. Watch these exercises at your own pace and before you know it, you’ll be speaking the language of love.

Make friends and learn a new language.
http://www.babbel.com

P.S. Added Babbel to Social Networking List