Back in the 2000s, Warner Bros had an official website for Hanna-Barbera. It basically included games, character biographies, downloads, and even a message board. The website was mostly flash and image-based, but those elements are rarely used in web design nowadays. It was located at hannabarbera.com , but now the URL redirects to the Kids' WB website.

However, there are still remains of the website. Here is how Hanna-Barbera represented themselves online back when the cartoons were easily available on Boomerang.

http://www2.warnerbros.com/web/hannabarbera/smf/index.jsp 

http://www2.warnerbros.com/web/hannabarbera/smf/article_detail.jsp?id=imix_jabberjaw_piranha 

http://www2.warnerbros.com/web/hannabarbera/smf/feature_detail.jsp?id=smf_gear_bettertoys 

http://www2.warnerbros.com/web/hannabarbera/smf/feature_detail.jsp?id=top_ten_flintstoneinsults 

http://www2.warnerbros.com/web/hannabarbera/gallery.jsp 

http://www2.warnerbros.com/web/hannabarbera/games_more.jsp 

Wow, the toy closeups and the games in the last two links still work!

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Here in Brazil and in the Latin America, great part of the Hanna-Barbera classics is broadcasted by the Tooncast channel.

Wow, the toy closeups and the games in the last two links still work!

I've been played the game Magilla Gorilla's Pet Shop Cleaning. And this game still works well.
I've been also played the game Yogi Bear's Snack Hunter. It was like if I was in the Jellystone Park.

As the Hanna-Barbera official site isn't avaliable anymore, there's the Hanna-Barbera official Facebook destination, whose link is the following: http://facebook.com/HannaBarbera .
Enjoy the visit on this link and good luck!