Hey, @TeamYouTube on some videos, it appears that instead of saying '#_ trending' it says '#ad' what does this mean?pic.twitter.com/uB0kzNhbgt
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
That's nice to know, I guess. I wonder why he put #ad instead of just enabling product placement.