You will hear of things like
1. multiply your bitcoins in few hours
2, send 0.1bitcoin and get 2 bitcoin
3. mine bitcoin for free
4 free sites that pay you bitcoin every minute
and many more schemes like that.
It is either these folks have little or no knowledge about crypto currencies or there stone hearted scammers ready to collect peoples hard earned bitcoins. Please be careful of such schemes.
Let me enlighten you a bit incase you dont know. The only legitimate way i know of getting more bitcoins is by 1. mining 2. trading and probably speculating on a long term.
All the above mentioned ways all come at a cost unless of course you steal someone else's coin. Even a farmer needs to part with a seed in order to have an harvest.
Mining gives you these coins no doubt but you need to invest in hardware equipments to do the computations for you. These hardwares don't fly and appear from the skies, you spend money to get them.
Trading and speculating also gives you more of these coins. But how do you acquire theses coins in the first place. you have to spend money to get them before you can use them to trade and speculate.
Unless of course somebody donates them to you for free. Any other means is a SCAM as far as i am concerned.
I stand to be corrected.
PLEASE I BEG YOU NOT TO FALL VICTIM OF THIS CHEAP SCAM. YOU NEED MONEY TO GET MONEY