Djokovic was initial to join a social-networking site in Mar 2011. He has 8.55m followers.
Nadal sealed adult 4 months after in Jul 2011 and has 15.6m supporters though it wasn’t until 2013 that Federer got involved.
The Swiss, a eldest of a three, assimilated in Apr of that year and he has 12.4m fans on a site.
As to because it took him so long, Federer pronounced to journal Baz during a Swiss Indoors: “I did not know accurately how it worked!