Salt Expiry not a hoax

Yes it can go bad.

Once you add in iodine, salt will last about 5 years. The iodine is added as a low-cost health initiative to prevent iodine deficiency and goitre. It only costs about 5 cents a year/person. Some salts add in anti-caking agents.

Dates on salt are often "best before" meaning the taste will not be optimum after that date. Moisture and sunlight can be factors in degrading quality. Moisture can make it harder to use.

So when you see a meme like this...ummm take it with a grain of salt?