"in chats". This is a blog post, a forum, not an SMS conversation with 1998's prices. Acronyms look-up on Google gets old really fast. I had to look for YANBU yesterday and it was not fun to get back to the orignal text after that.
I would never have guessed what ATVI was. So audience is important, which means for a public post, stock symbols probably aren't a great idea.
It's the first result not only on Google but DuckDuckGo as well. Do you not search for unfamiliar terms?
Sure I do. But if one has an aim to be understood, it's better not to make everyone lookup what you're referring to. If something has a well known name, use the name!