Among U.S. teenagers, Facebook (NASDAQ:FB) appears to be taking a back seat to more intimate social networks that have the ability to share with a smaller intended audience. Over the long term, this trend could prove problematic for a company that has just begun ramping up its business efforts. In this video, Motley Fool contributor Steve Heller explains why teenage trends matter and how they could ultimately threaten Facebook's business down the road. Steve also points outs why spending over $1 billion on Instagram last year was probably a good decision.

Fool contributor Steve Heller has no position in any stocks mentioned. The Motley Fool recommends Facebook. The Motley Fool owns shares of Facebook. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.