Anyone (or anything) can potentially publish RDF data. In order to know whether you should use their data, there are many issues of trust. There are (at least) two important categories of trust when it comes to the semantic web.
1) Personal Trust
Personal trust amounts to trusting that the creator of the data has the right motives. Spam is a good example. This kind of trust will become more important as the semantic web grows, but isn't a major problem yet.
2) Reliability Trust
Being able to trust data found on the semantic web requires knowing how reliable the data is. Was it created by experts? Is there a peer review mechanism? Was it created by automatic natural language processing? Currently this kind of trust is also not too important, but I believe it will become very important much faster than personal trust. We already know how to solve the reliability trust issues, with more metadata. We will need data about how the data was generated. (Note that implementing this allows more options for lying about data, and so doesn't really help with personal trust issues).
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