Dinokids (http://dinokids.com/)

At the time of review, the site was still adding content to make the world more robust, so it's hard to say whether a subscription is worth the money. Kids can choose the dinosaur type, name, and color for their avatar and play games -- many of which are environmentally themed -- all for free. Younger kids may also enjoy climbing up and down the site's ladders and levels. However, the free version doesn't include a lot of activities, and might not keep older kids interested for long  (it’s probably best for kids in the 5- to 7-year-old range). The real incentive for shelling out the cash for a site subscription? Parental controls. You’re able to predetermine your kids’ playtime, chat options, and site profile. If you’re hesitant to sign up for six months or a year, there’s also an option to pay $4.25 to test the monthly plan out, which includes a 7-day free trial. But take note: Any plan you pick will renew automatically after you charge it to your credit card.

Online interaction: Kids have a lot of interactive options, including two kinds of chat, multiplayer games, a "movie theater" that they can watch and discuss remotely with a friend, a screenshot-sharing tool, and more. The site uses filters and monitors to keep it clean.