Today, there's a Social Media for everything and everyone. Its beauty, it brings a more personal and human touch, by personal tone and language it brings into play.
Blogging entitles us to show our passion and concerns while covering, discussing and reviewing that stuff around us.
The ability too reach out. To share and connect with people unlike traditional forms of marketing. To engage with specific demographics or simply be a passive campaigner.

Its important having something to contribute to a larger conversation and be a valuable source of information.