|Date(s):||23 April 2011 - present|
|See also:||Block B, APink, Boyfriend (band)|
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Their debut song was O.K..
B1A4 fans are called BANA (바나). Their official fan color is pastel apple lime green.
The fandom originated on LiveJournal, before LJ's release 88. Since then, B1A4 fans have spread across Tumblr, Asianfanfics, and AO3. There have also consistently been fans on Twitter since B1A4's debut.