Ear Worm: Songs like That's What Makes You Beautiful and One Thing. All ever present on the radio.
Ho Yay: A lot of fans believe that Harry and Louis are romantically involved,due to the high level of Bromance between them. Although this pairing (known as Larry Stylinson by some fans) is the most popular, all of the band members have been shipped with each other at some point or another. This results in a whole range of different OT Ps that shippers support: Zayn/Niall, Zayn/Liam, Niall/Liam, Zayn/Harry, Harry/Niall, Liam/Louis, etc.
Internet Backdraft: Apple offered one of their singles for free as a part of a promotion on iTunes, a large number of negative reviews of the "not even if you paid me" type came from the Hatedom appeared and left the single at 2 out of 5.
Fandom Rivalry: iCarly casting One Direction as guest stars caused instant drama, mostly on Tumblr. One Direction fans derided the iCarly fandom as being comprised of "immature 12 year olds" that would somehow swamp out the non-12 year old One Direction fandom, iCarly fans shot back with "who are One Direction and why have I never heard of them?", that iCarly is far more popular than One Direction ever will be, and reminding the One Direction fans that the majority of it's fandom are much older due to how long the show has gone for as well as having a lot of mature humour.