You can assume the number if users in bitcointalk.Only if you can track the IP of the users then you might get an estimate. But there's no easy way to do it.

it is difficult to determine it. if we look at the market, we can only see the market cap, and that's the amount from the beginning of bitcoin to date. so to determine the increase in users from year to year or month is very difficult.

At the moment I think that the majority of the people are using bitcoin more on the exchange rather than to actually pay for goods, services etc, so I think it's really hard to determine who many users actually use them.

In our country we the app using coin ph is only 5 million in last 2017 i dont know right now how many using bitcoin right now

the people that use bitcoin right now is just a little, its less than the other currencies like USD and other fiat because we can see that in my country there are only small people that know about bitcoin, and all of them that know about bitcoin is not use bitcoin, they just now about bitcoin and the price increasing. only just that

We can not tell how many people use bitcoin. I guess there must be a Chinese Bitcointalk equivalent. Then extrapolate numbers from that with updated information from public wallet providers, like Blockchain, and also many people are using multiple wallet for security reason.

I think that there is no sure way to determine how many people actually use bitcoin. Clearly the number using bitcoin is less than 21 million people because the number of bitcoin alone is 21 million and some people have bitcoin more than one so it can be ascertained that number of peoples have bitcoin less than 21 million. Even now, I have never heard that blockchain bitcoin platform can determine the exact number of people who use this bitcoin. We also can not know who is acting as an old player and who new players because all are free if it is already in the market. Different from this forum that can be distinguished from the rank level.

We can't determine the actual number of people using bitcoin because that is impossible to go around the world and ask every people if they are using bitcoin or not because there is a lot of people who uses bitcoin and it is not enough to measure them using the number of bitcoin wallets because it is so easy to create bitcoin wallet so there is no way for me to measure the actual number of user of bitcoin.

Well, the last time I counted I found 36 people who use bitcoin. The rest of the people just talk about it and wish they had some.

I dontthink there is a way to get the actual amount of people using bitcon because thousands  people get to invest everyday thousands of wallets are created there is no way of getting an absolute number of persons or people using bitcoin