Twitter/YMMV


 * Americans Hate Soccer: Averted. When The World Cup was on, it was heavily trended even among American twitterers.
 * Brett Erlich played this straight though with this: "Twilight's like soccer. They run around for 2 hours, nobody scores, and its billion fans insist you just don't understand."
 * Dude Not Funny: Every so often, some users like to spread a rumor on Twitter that some celebrity has died when they're still very much alive.
 * Or even worse, joking about city council budget cuts.
 * Fan Dumb: Good lord there is a reason so many people have grown to despise Justin Bieber and One Direction even if they were at worst neutral to them before. Beliebers and Directioners (among others, but they stand out the most) take it upon themselves daily to start trends about them for almost no reason, get in the way of actual world events, hijack anything tangently related, and get offended en masse by other users (or even Twitter admins) wanting them to just shut up already.
 * Germans Love David Hasselhoff: Brazilians are notably fond of Twitter and frequently hijack the trending topics with things like #brazilloves[insert popular american musical act such as Justin Bieber or the Jonas Brothers].
 * Notably, "CALA BOCA GALVAO", a complaint against an obnoxious sports announcer that somehow became a campaign for saving endangered birds.
 * Hate Dumb: There are people who refuse to get a Twitter account because of excuses like "I don't want people to know I'm on the toilet", etc. Never mind that it's up to the user to determine whether or not they want to make posts like that.
 * And then there are those who refuse to register because they think other people's streams are nothing but shallow self-indulgent posts, so not entirely fair.
 * Hype Backlash: As with any website with social networking elements, it gets quite a bit of this.
 * Misplaced Nationalism: You'll find this quite a bit. We'll keep it at that.
 * One such instance happened during the Suzuki AFC cup finals first leg where Malaysia won 3-0 against Indonesia and Indonesians accused Malaysians (which was the home team at that time) of pointing laser beam at its team's goalkeeper, despite there are proofs of Indonesians did it at first during group matches. It managed to top the trending for a few days, outdoing Justin Bieber.
 * Relationship Sue: Parodied with Edna Fry, wife of Stephen Fry (who is gay). She's attracted a huge fanbase - primary among them being Stephen Fry.