I would not recommend u to exchange your flat or real money for bitcoin. It's too risky. Better just sped some minutes of your free time with commenting and getting bitcoins for that. After u pass newbi rank u may join some campaign that will pay u 
Do you just said commenting is also one of the way to collect btc? How is that possible?
I think his mean is to signature campaign. commenting on this forum and earning bitcoin. yes it is possible but not with a newbie account. you atleast have to be a Jr member here and you have to be a good quality poster. you should have some knowledge about bitcoin. then you can earn some money with posting here..