I have about .5 BTC to invest and looking for a method to grow my investment. I already know about the Ebay method and earn pretty well with it but limited to $250 profit per week.
Add me on skype: joshc619
It's the same as earning fiat, think of something you can offer as a service, do micro jobs, translations, write articles etc.
The people adding you on skype now are probably just after the 0.5 btc you're holding now. Like any other site asking for money to a guaranteed income they are usually just not true.