https://www.cbsnews.com/news/social-media-is-a-tool-of-the-cia-seriously/
In fact, you can read it in this article which is conveniently titled, "Social Media Is a Tool of the CIA. Seriously"
They even added the "Seriously" after a full stop for extra emphasis.
Just to let you know they were serious.
A while ago, Pepperidge Farms, known for their bagged cookie line, ran an ad campaign sometime in the 80s where they said remember when, then mention a bunch of nostalgia and then said Pepperidge Farms remembers.
Edit: typed 90s on phone screen...