The trailer is only 2 and a half minutes long, but the book trilogy written by EL James has sold more than 100 million copies worldwide. It is still uncertain where all the views have come from seeing that the YouTube video only has around 32 million views, but trailers also screen ahead of movies in theaters, they are on iTunes, the Today Show was screening it on their television broadcast, and just about every website writing about this movie has a link to the trailer. The studio did disclose that roughly 40 million views came just from Facebook postings.
Hell, just for fun here is another link to it.
Fifty Shades of Grey stars Dakota Johnson and Jamie Dornan in the main roles of Christian Grey and Anastasia Steele. The film hits theaters on February 13, 2015.