Translation of arista

My brother moved there last year. He met a woman and went after her. After six years they have broken up, but he no longer wanted to return, because he has settled down in his new home. I am visiting him once a year.
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.
This is a fantastic idea, I am learning German just since last year. I speak, write and read well, and I will improve soon. This site, Vocabulix, I'm visiting often and I am mostly online.