TechYob

Interesting approach to folksonomy and the semantic web called Freebase.  Im a big believer in a bottom up approach in comparison to building a structured ontology (see the Cycorp project).   However, in order to be a truly useful service it needs some form of antisubverion built in, otherwise it just becomes another platform for spam.  Therefore ultimately there will need to be a combination of algo and human-tagging for the semantic web to become truly useful.  Last year I built an alpha product with a similar approach to Freebase, but also overlaped social networks as a way of building relevance and subversion resistance.  One of the biggest challenges they will find is being able to scale out to a respectable number of users, as internetworking graphs of meta-data presents a very real indexing and real-time query challenge.  I look forward to seeing more projects in this space.