Socialbitcoin.io is listed as a SCAM site in badbitcoin.org. Do not ever try to put in your hard-earned money. It was already reported that some users were not paid. It might happen to you if you ignore this warning.

Socialbitcoin.io WHOIS Registrar

Domain Handle :
DOM-436163
Domain Name :
socialbitcoin.io ... (Check socialbitcoin.sh)
 ... (Check socialbitcoin.ac)
 Domain Status : Live
 First Registered : 2016-08-01
 Last Updated : 2016-08-01
 Expiry :
2017-08-01 ... Redemption Grace Period Ends, 2017-10-31 00:30
 Back-order : Available
... Purchase a Back-Order
... (What is a back-order?) 
 Domain Owner 
 User ID : NIC-1358089 
 Contact Name : WhoisGuard Protected  Organization Name : WhoisGuard, Inc.  Street : P.O. Box 0823-03411 
 City : Panama 
 State : Panama 
 Postal Code : 00000 
 Country: PA

Anyone must be very careful in joining this kind of scheme. The internet nowadays is crowded with scam sites. High-yield investment (HYIP) is a kind of Ponzi scheme. It has an interest of 10-50% or sometimes doubled in a short period of time. The investor will only be paid when there are new members joined and invested.

People said, you have to understand the risk when you join a program like this. Invest only what you can afford to lose. However, my advise is to stop putting in your hard-earned money in any high yield investment company. I bet 99.9% HYIP are scam. Find something on the internet where you can make real money. They are hard to find, but they are real.