I will not prefer to invest my bitcoin in any online site, but I will keep on investing my fiat money in bitcoin itself, as I think that can be the best investment for future.
There are many ponzi sites available now which are difficult to trust, its better to invest in bitcoin and hold it for next 5 years to get best out of it.
That is true. I buy the bitcoin when the price is low. Then I will hold it for the long term for the high prices.