Translation of alfalfa

On the other sites I work with every 3 to 6 months developers are called together to exchange experiences. Everybody is kept up to date and new projects are introduced. It is good for workflow.
It is called Facebook viral marketing. I'm 62 and it's somewhat mystifying, but my two boys are using it continuously. What I'm a bit afraid of is the personal information they send to everybody. It has no privacy.
I speak a little English. I would be happy to teach you German as well. May I can introduce myself? My name is Jürgen and I live in Dusseldorf. 25 years ago I was born in Mannheim, Germany.