These are internet rumors or urban legends that got their start on the internet, through chain emails, social media postings, etc.
A video on YouTube entitled 'Experiment Pouring Coca Cola in Stomach Acid!! - Epic Reaction!,' or 'How Coke Reacts to Stomach Acid,' between YouTube and Facebook, has been viewed millions of times. Posted by a channel called Molten Science, it purports to show what happens when Coca-Cola comes into contact with stomach acid, or hydrochloric acid. The video starts by showing a square glass containing a small amount of clear liquid with a can of Coke sitting next to it. We cannot tell what the liquid in the glass container might be, but it is supposed "stomach acid."
Since 2001, warnings have circulated via Email and Facebook warning people not to use Canola oil because it is highly dangerous to humans. According to such messages, you shouldn't use Canola oil because it is made from a genetically engineered plant developed in Canada "which is part of the mustard family of plants."
A viral image of a grocery store receipt from Menominee, Michigan has been circulating online since May of 2011. The receipt, from Angeli's Country Market, lists fresh cold water lobster, porterhouse steak, and diet Mountain Dew, totaling $141.78, dated February 8, 2011.
I recently noticed an Instagram post under the hashtag #foodfacts, which I use for my CulinaryLore posts on Instagram. The image claimed that chocolate milk is actually made from expired white milk that is sent back to the processing facilities, boiled down and re-pasteurized, then mixed with artificial synthetic chocolate flavoring, sugar (GMO). In other words, chocolate milk is a way to get another month of shelf-life out of white milk while adding a lot of bad stuff.
An internet rumor states that the onions in White Castle burgers are not really onions at all. Instead, they are little pieces of cabbage that have been soaked in onion juice. Could this rumor be true?
A press release, claiming to be from the Illinois Natural Resources Department, appeared online in the early part of 2005. The release announced that anyone wanting to pick mushrooms would need to get a license. To get such a mushroom picking license, you could go to the same places where you got a hunting or fishing license. This upset a of mushroom hobbyists. The Natural Resources department received a great many enraged phone calls and had to clear up the confusion with a real press release stating they had never made a press release about a mushroom picking license. You could go right on picking mushrooms without the state interfering.
Recently, in September of this year, a message started making the Facebook rounds that claimed a worker had put his HIV tainted blood into bottles of Pepsi products.
This email popped up at least as early as 2006 and has been handed around on Facebook, etc. since then. It purports the miraculous discovery that cooked and blended asparagus, given as doses twice a day to cancer patients, cures their cancer. There is no evidence whatsoever that asparagus, or any other single vegetable or food, cures cancer, or alters cancer cells in any way once you have cancer. A healthy diet, with asparagus as part of it, however, can help to prevent some types of cancer (but not all, and not close to completely).
Since around 2003, a compilation of "facts" about margarine has been circulating on the internet, probably starting from one or a number of email chains. Such chain emails are quite common, and they often find their way onto various websites, or social sharing networks such as Facebook, where they are posted as if they are facts from a credible source. Many websites don't even bother to mention the origin of the post, and publish them as if they are a normal article like any other article on the web. The "margarine was invented to fatten turkeys" message is a popular example of just such an instance.