I don't think this question has already been asked.

How many of you have tried Q&A for link building before? And how many of you are still doing this?
I just wanna know if it is still an effective technique for link building. I am very much aware that links are set to as "no follow", so I just wanna know what are the benefits that you can still get aside from traffic (probably)?

Please feel free to share your thoughts about this, thank you!