If you are blogging, to create visibility for your own brand or organization it is key to of course comment on other posts as well as Rt'ing. When you post it to Facebook, it is good to state the importance it has to you, because you want your opinion to matter.
https://confusedyetamused.wordpress.com

To often we don't (including me) question whether something we've read is accurate and important. The more we ask these things of ourselves and the information we consume the better social media, marketing and PR will be.

Great post. Got me thinking and changing the way I view things.

I would be lying if I denied having asked myself the same question before. Although, I am unsure of the exact reason for this, I've chalked it up to mechanics. PR pros tend to be wired as enthusiasts passionate about generating exposure for their clients. They're genuinely excited about creating discussion, and especially keen to any chance they have to expand their community.

If the novelty is wearing off, maybe it's a good thing. To me, realizing you could have written a blog post similar to one you praise, represents growth. If one person's growth and new-found confidence to be more vocal is the result of retweeting posts, or from being exposed to interesting discussion, then we've all been doing something right.