Thanks a lot @exyle for this information. I never knew the difference between the steem block chain, steemit.com, and busy.org.Now am well informed. Thanks
I use busy.org alot, and I'll just like to add just 1 little thing to the wonderful things you've said about busy.org.

Busy.org also offers an open-source and secure social network layer to bootstrap any Apps (like Facebook Apps does, or WeChat services), games, community tools, marketplaces for good or services, using Steem.js API, SteemConnect and the Busy.org 'framework.'
So it's not only about posting and commenting, but also making your social media experience, and gaming experience much more fun.