Growing would actually refer to methods of investing your bitcoins to gain additional interest, while signature campaigns and faucets are actually free. anyway the best method of investing is trading BTC to USD price, if you know or can predict the market movement.
Yes signature campaign is a method of getting bitcoin free and easy. Has proven a lot of bitcoin users who use the signature campaign.
Maybe if it had been getting money from signature campaign we could try to trade in bitcoin. Who knew we'd get more profit.