A variant, which is more interesting to think about: Could a single average programmer, starting today with cloud technology available today, build a Twitter c

A variant, which is more interesting to think about: Could a single average programmer, starting today with cloud technology available today, build a Twitter clone in 7 years if he would get the current +200M users at the same pace as the original Twitter got? Twitter clone here meaning a replica of Twitter 2013, with all supporting functionality (ad management etc.). I say no, (s)he wouldn't be able to build it.