Companies such as Eloan, Amazon Services and Knight Ridder pay Efficient a 5%-to-15% commission for access to its terabyte of data on which keywords and ad strategies have genuinely clinched sales.

FORBES: The Keyword Keeper

By simply visiting the Parents Portal on MEEPTablet.com from any device with a web browser (computer, smart phone, tablet), parents can not only hand-pick ("whitelist") which websites or keywords their kids have or don't have access to, but they can add words to the tablet's built-in "bad word" list so their child will not be able to search for those words or use them in the chat feature.

ENGADGET: Oregon Scientific MEEP! tablet ships for $150, gives kids a safe, exclamation-filled place to play

But because filtering programs use keywords to block material, they can inadvertently restrict content you want your children to access.

CNN: Tools: Protecting your kids online