there is no safe way to grow your bitcoin, because they all have risks.
but you stay focused on the signature campaign, if you want to be safe without risk.
Yes signature campaign is the safest way now where you can get and earn bitcoin. Because any investment now as he said that they have risk to invest in any investment site. If you can earn all your income here in bctalk you can grown easily your bitcoin by posting and wait your salary to send in your wallet. No one is safe now bctalk sig is the safest way to grow your btc.