Comment by dizzystar

My main issue with that number is the assumption that Twitter will still be around or significant by 2023. If the past 10 years are any indication, the internet user-base is fickle and moves around a lot. There really isn't enough data-points from the past 10 years to reliably predict trends for the next 10 years, unless you want to say that there will be tons of carcasses and has-beens.