According to some estimates, as many as 85% of Facebook ads and 60% of YouTube ads are hidden from public view. The practice is even more common on Twitter, where an estimated 90% of ads are hidden. What does that mean, exactly? Rather than posting their messages publicly, major brands are creating social media posts or sponsored content that is only shown to targeted audiences. Unlike organic or boosted posts, these targeted ads don’t show up on the company’s timelines or all of their followers’ feeds.