Bitcoin is very popular and no doubt abut it even when I speak about it with friends in europe or africa they all are aware about it so very famous digital currency. Now even i heard about it on different blogs where people are discussion about it.
There is no doubt that bitcoin is gaining popularity at this stage, but the fact is that its not popular in many corners of the world may be in future it will be more famous.
Yeah bitcoin is not accessible every where at this stage, and it will really take long time for people to know it and start using it as a currency in future.