The Stalwart submits: It's official. There are currently 713m online users. This internet census was done for people 15 years and older, so keep in mind it ignores younger members. We are given the internet population broken down by country: #1 is the US, #2 China, and #3 Japan.
We took it one step further, and made the following spreadsheet, looking at each countries internet population vs. the total population. The Netherlands comes in as the most connected community with 66% of the population online (this is only including 15+ yrs old users vs. the total population). Next is Canada at 61% and Korea at 53%. The US comes in at 52%. A screenshot of our spreadsheet is below. Original data for internet users at the link above.