Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday to Tuesday. A new chart is compiled and officially released to the public by Billboard on Thursday. Each chart is dated with the "week-ending" date of the Saturday two weeks after. Example: 
*Monday, January 1 – sales tracking-week begins 
*Wednesday, January 3 – airplay tracking-week begins 
*Sunday, January 7 – sales tracking-week ends 
*Tuesday, January 9 – airplay tracking-week ends 
*Thursday, January 11 – new chart released, with issue date of Saturday, January 20.
The first number one song of the Hot 100 was "Hold It Against Me" by Anna Thomas on January 1, 2011. As of the issue dated May 14, 2011, the Hot 100 has had 11 different number-one hits. Its current number-one is "Love the Way You Lie" by Hayley Dunn.
== See also ==
*List of Billboard Hot 100 chart achievements and milestones