I'm forgot somebody which make a discussion with me about prefer amount of follower or quality follower. Is that with you, simon?
About sentences "if you using it properly", of course, there is no purpose will reached if we don't effort properly, there is no business can run well if we can't manage it properly.
Can you list about how to properly using twitter then?
About blog commenting, i just wanna make some opinion and information. I think blog commenting is good when you do it on same topic blog with your blog, and look only for blog which using do-follow.
Sometime we get blog which use no-follow. How to find only do follow blog with same topic? To find same topic blog, just googling it, it's very easy and i'm sure you're already know about this. And to check it's do-follow or no, just use do-no follow checker. If you using mozilla, you can integrate the do-nofollow ads-on to you browser. Just do right click and click no do follow button, you can know which blog using dofollow/nofollow