This recent report from Mobile Marketer is bound to have some effect on mobile marketing targeted to the younger demographic.

"With tweens and elementary school kids increasingly carrying smartphones with Web access, many marketers are looking to reach those audiences through SMS and mobile-friendly Web applications. 

Marketers seeking to attract those age groups must, however, remain vigilant about privacy compliance.

As a recent Federal Trade Commission settlement with Sony BMG Music Entertainment (Sony Music) illustrates, interacting with the under-13 crowd remains a precarious marketing activity that must be vigilantly monitored."

Read the full report here.