It has just become the most-viewed video of all time and the first one with over 3 billion views.
I can't understand it. Maybe it's got to do with Luis Fonsi's Puerto Rican roots, appealing to North and South America at the same time. But the song is still meh.
It's a mix of timing, good luck and great management from part of the agents:
1. Until Justin Bieber recorded the remix the song was already pretty popular in Latin America but its popularity was actually fading. A typical popular reggeaton song has many views in Youtube between 0.5 and 1.5 billions of views).
2. Once Justin Bieber launched the remix, many people was attracted to watch a video on youtube with more than a billion views.
3. The song is catchy, so is very easy to attract a person who doesn't understand anything.