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Defining the Semantic Graph -- What is it Really?

This is written in response to a post by Anne Zelenka.

I've been talking about the coming "semantic graph" for quite some time now, and it seems the meme has suddenly caught on thanks to a recent article by Tim Berners-Lee in which he speaks of an emerging "Giant Global Graph" or "GGG." But if the GGG emerges it may or may not be semantic. For example social networks are NOT semantic today, even though they contain various kinds of links between people and other things.

So what makes a graph "semantic?" How is the semantic graph different from social networks like Facebook for example?

Many people think that the difference between a social graph and a semantic graph is that a semantic graph contains more types of nodes and links. That's potentially true, but not always the case. In fact, you can make a semantic social graph or a non-semantic social graph. The concept of whether a graph is semantic is orthogonal to whether it is social.

A graph is "semantic" if the meaning of the graph is defined and exposed in an open and  machine-understandable fashion. In other words, a graph is semantic if the semantics of the graph are  part of the graph or at least connected from the graph. This can be accomplished by representing a social graph using RDF and OWL, the languages of the Semantic Web.

Favorite Site of the Week: Slideshare.net

Slideshare is a site where people post and share their Powerpoints. You can watch the powerpoints quickly with a little viewer widget that let's you click through them in your browser. There are some really interesting, creative, and informative presentations there. It's addictive, I've been looking at presentations all morning. Can't stop. (Thanks to Peter Royal for telling me about this).

Jim Hendler on the Chaotic Semantic Web

Jim Hendler, who co-created the OWL language of the Semantic Web has written an interesting post where he comes out with his refutation against criticisms of the Semantic Web.

Powerpoint Deck: Making Sense of the Semantic Web, and Twine

Now that I have been asked by several dozen people for the slides from my talk on "Making Sense of the Semantic Web," I guess it's time to put them online. So here they are, under the Creative Commons Attribution License (you can share it with attribution this site).

You can download the Powerpoint file at the link below:

Download nova_spivack_semantic_web_talk.ppt

Or you can view it right here:

| View | Upload your own

Enjoy! And I look forward to your thoughts and comments.

Quick Video Preview of Twine

The New Scientist just posted a quick video preview of Twine to YouTube. It only shows a tiny bit of the functionality, but it's a sneak peak.

We've been letting early beta testers into Twine and we're learning a lot from all the great feedback, and also starting to see some cool new uses of Twine. There are around 20,000 people on the wait-list already, and more joining every day. We're letting testers in slowly, focusing mainly on people who can really help us beta test the software at this early stage, as we go through iterations on the app. We're getting some very helpful user feedback to make Twine better before we open it up the world.

For now, here's a quick video preview:

True Knowledge is Cool

The most interesting and exciting new app I've seen this month (other than Twine of course!) is a new semantic search engine called True Knowledge. Go to their site and watch their screencast to see what the next generation of search is really going to look like.

True Knowledge is doing something very different from Twine -- whereas Twine is about helping individuals, groups and teams manage their private and shared knowledge, True Knowledge is about making a better public knowledgebase on the Web -- in a sense they are a better search engine combined with a better Wikipedia. They seem to overlap more with what is being done by natural language search companies like Powerset and companies working on public databases, such as Metaweb and Wikia.

I don't yet know whether True Knowledge is supporting W3C open-standards for the Semantic Web, but if they do, they will be well-positioned to become a very central service in the next phase of the Web. If they don't they will just be yet another silo of data -- but a very useful one at least. I personally hope they provide SPARQL API access at the very least. Congratulations to the team at True Knowledge! This is a very impressive piece of work.