Translation of quartet in Spanish

For each entry, there will be the translations of the dictionary, so if one entry is already included there is no extra value in adding this word and I'd say mark it as an error although it is correct.
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.
Tomorrow I have my test, so I have to practice a lot, but it should have started to study much earlier. I can only act under time pressure, I'm just like that... . I am 25 years old and I am married.