Most of the people I know who have weblogs are technology and marketing folks. They have embraced the medium hoping to spread their mantra or help someone with a problem, and in some cases they get a few listeners or contribute a solution. The rest aire differences, bash companies, talk about their significant others, what they ate for lunch yesterday, and spread nasty rumours about their political opponents.
The first group wants to be there, and understand the whats and whys of being there. The rest may or may not understand that their words can be archived for eternity, subject to scrutiny, and even get them in hot water (if they say dangerous things).
Once someone calls you out, don’t expect to dance around the issue. You said it, and now you have to pay for it. And keep in mind that your audience comes to your blog to listen to ideas – they don’t care what you do for your day job. And that audience could be anyone, anywhere. Nobody will be particularly impressed by where you live, that is unless you are crossing a border under questionable immigration auspices.