According to Bleeding Cool, the rumors were sourced back to the Twitter feed of RCN "entertainment co-ordinator" Jorge Luis Balaguera, followed by posts on the news sites Terra and ElSalvador.com, all of which treated the news as a surety.
Disney and Pixar were both reached by Buzzfeed's Adam Vary, who tweeted out that the rumor was, at least, a rumor. But no more:
Disney tells me nothing official has been announced about Toy Story 4. They're investigating where this info is coming from in South America— Adam B. Vary (@adambvary) February 19, 2013
A Pixar rep on Toy Story 4 rumors: "We do not comment on speculation or rumors."— Adam B. Vary (@adambvary) February 19, 2013
Vary also pointed out that, true or false, news of a potential fourth Toy Story film almost certainly wouldn't break this way.
Pixar is pretty busy between now and 2016: Monsters University, The Good Dinosaur, The Untitled Pixar Movie That Takes You Inside the Mind (also possibly called Inside Out) and The Untitled Pixar Movie About Día de los Muertos, all due out before the supposed Toy Story 4 release.
Based on past habits, Pixar won't let the world know it's working on the film (should it come at all) until it's good and ready.
Still logic played no part in Twitter's reaction to the rumor, where "Toy Story 4" was a trending term.
A tweet from @UberFacts had more than 11,000 retweets and plenty of giddy replies.
Disney is planing to release a "Toy Story 4" in 2015.— UberFacts (@UberFacts) February 19, 2013
TOY STORY 4 HAS BEEN CONFIRMED twitter.com/JAMESSEEKINGS_…— James Seekings (@JAMESSEEKINGS_) February 19, 2013
Toy Story 4 ahhh yeahh my childhood yeah— Peyton Sanders (@TheRealPsanders) February 19, 2013
"TOY STORY 4 WAS CONFIRMED TO COME OUT IN 2015" twitter.com/flopyvalle/sta…— †(@flopyvalle) February 19, 2013
There is going to be a Toy Story 4. I have officially lived. twitter.com/ItsCodyMills/s…— cody rυѕѕell мιllѕ (@ItsCodyMills) February 19, 2013
The official @ThePixarTimes account offered a sober reminder that the rumors were just that.
Oy, Toy Story 4 is trending. As a reminder, Disney/Pixar has not announced/confirmed its existence. Still only an unsubstantiated rumor.— The Pixar Times (@ThePixarTimes) February 19, 2013
And there were plenty of suggestions for what the plot of the movie might be, many rehashes on a few repeated jokes.
Toy Story 4 is just going to be a bunch of fat kids playing on iPads and not interacting with one another.— JΛCKΛLΛNON(@JackalAnon) February 19, 2013
Toy Story 4 is just going to be a bunch of fat kids playing on iPads and not interacting with one another.— OhNo$heTwitnt (@OhNoSheTwitnt) February 16, 2013
Toy Story 4 - Apparently the toys visit Andy in uni. 'Dude, I'm so stoned. My old toys are talking to me'— Luke Brown (@gr4sshopp3r) February 19, 2013
Toy Story 4 has been confirmed! Here's an artist's rendition of what the poster might look like: twitter.com/blinkbox/statu…— blinkbox (@blinkbox) February 19, 2013