The Bitcoin community is a fairly solid one but like anything gathering traction, rogues will infiltrate at will. The anonymity of Bitcoin with the benefit of decentralization can also be it’s weakness.
Scam sites can remain undetected and once your cryptocurrency leaves your wallet there isn’t a great deal you can do to get it back. One site looking to change all that is Badbitcoin.org which lists dubious websites.
Kosher sites can ask to be delisted from the site if a mistake has been made, but the site is worth a scan before you dive in to any double your money schemes. One such site currently advertising heavily is doubleurbtc.com. It promises quick returns on your investment with daily payouts. The only problem is that once you’ve received the first few payments, your account suddenly disappears and you’ve been scammed!