Sure. Steemit is website that is using Steem blockchain, to be more exact: When you post,comment or upvote - it gets recorded to the blockchain. Steemit is website that focuses on blogging content but DTube is our very own Youtube like service. There you also post,comment and upvote but as you can imagine, it all revolves around videos! The same applies to Dsound but in that case we're talking about music. Just like Soundcloud.

I'd also like to let you know of:

• Dmania, earn Steem for memes.
• Busy, more modern looking website for blogging
• ChainBB, if you prefer old style forums.

These all services operate using Steem blockchain. And you can log into them using your account that you already have - @steemadd