I will just elaborate the trust that you've got in able to warn people here.
Any BTC sent to this user will be permanently lost. Don't click on any link posted by him. Don't believe anything he says.
Scumbag ponzi 'doubler' scammer. Does not give one single shit who he steals money from because he clearly feels the world owes him a living and other people do not deserve the money they have, no matter how little a sum it may be, nor how desperately poor they might already be.
Trying to steal from the community.
Using double-spent transactions to trick newbies into believing their "doubler" ponzi scheme was actually paying anyone.
There is no such thing like a coin doubler. If someone claims that, they run a ponzi.
Used double-spends to defraud naive victims of his "double your bitcoins" scam.
Runs "Instant Bitcoin Doubler" that appears to be misleading participants by sending out "double" payouts that never confirm. Do not send any coins to this user.
And all of them are dated within this year, so don't believe to this guy for whatever he offers.