Multilingualism is not my strong suite. I only know one main language and parts of another
I am the same way, I think the official definition you have to be able to speak more then 1 language fluantly
It amazes me anyone that knows more than 2 languages well
It is hard to believe multilingual speakers outnumber those who speak only 1 language
Really?! That's crazy! Do you know much else about multilingualism? 
These days because of the use of the internet peoples exposure to additional languages is becoming much more frequent
I wouldn't think it would have that much of an impact. So people are teaching themselves more now?
yes, but even in the case of bilinguals, one language usually dominates the other