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Bot's don't accept cookies - so if there is a page/section on your site(usually user area requiring login) which requires a cookie in order to access it - the bot wouldn't make it there. If this was a page you needed indexed, that would be a problem.

Great answer Dennis!

I think a good way to look at it is that if Google sees a blog post and is ranking it well for some search related to photography - they think you are knowledgeable & trustworthy. If they think you are knowledgeable and trust worthy about photography in general, they will assume you are knowledgeable and trustworthy about photography on a local level and reward you as such.

Dennis mentioned some steps you need to take to ensure that Google knows you desire those local SERPS - address citations being the most important. As Dennis also alluded to, there are other steps which you need to take as well to optimize your results, but a blog is a great start.