Fair enough point, but I don't necessarily agree with that view. Why wouldn't you want to focus on building an audience on a site you control? You can link out to Twitter or Google+.

Like I said, the short pithy comments have their place too, but for me this strategy is what I prefer. Also, I haven't seen solid evidence that people are building larger audiences on Google+, unless you're someone like Robert Scoble. You have to have an established name in your industry, or at least that's the trend that I've seen thus far.