How Many of You Are Still Using Web 2.0 & Getting Good Results

After all these Google updates, how many people still find web 2.0 links effective for increasing their site rankings?
Kindly share your experiences with us all about using web 2.0 for link building.
Also clarify whether:

you are using original content or spun content on the web 2.0 pages
you are building second tier links to those web 2.0 properties or not
how many posts you have on every web 2.0 blogs you create (whether a couple of posts only or a lot more)

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How Many of You Are Still Using Web 2.0 & Getting Good Results

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