They certainly are grabbing a lot of attention in various media platforms like Facebook, Instagram, Twitter, etc. Do you often see how people post bizarre transitioned texts that look uniquely styled? These texts are portrayed as part of memes or images, some of which look nicely framed while some look very creepy. Zalgo Text is a distorted version of the normal text that looks like a scary. One can easily create a custom creepy or Halloween text style using the online Zalgo text generator here.
In other words, one can easily generate creepy Zalgo text by adding a specific mark to the letter or string. Zalgo is a fictional character, while Zalgo text aka glitchy text aka is a combination of multiple characters to each letter.