People are wired to connect. Neuroscientists have discovered that there is a part of our brains in the prefrontal cortex that helps us tune into other people, making the connections that are necessary to create relationships that help us survive.
How does this little bit of neuroscience have anything to do with blogging? Because the most successful blog posts are those where the writer has tuned into something that the reader is experiencing. This affects that part of the brain, generating an emotional connection with the reader.