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Simple answer (which you wont like) is that nobody has a good idea why it happens. I had a site where no links were created drop significantly in rankings. Why? Have no real idea. Content is good, your social media signals are good, wait a few days and check it out then.

Hello! It isn't a clear cut answer on it. For example, Penguin 2.0 hit a day ago. Some of the sites I managed saw decreased rankings, while some shown increased. Some of them were hit by what it seems is spammy links created for them, but some have not. I am really into believing Google simply ignores these spammy links as they are not real, they do not poise any real threat, show no real relevance and that's it!

Hello! I have a website that has been hit with around 120-150 spammy bookmarking sites which I believe are just scraping content from one another or were added by someone that was hired earlier or maybe some other action, but that really doesn't matter. My question is whether I should be worried about that many domains linking to the site in question with anchor text that is "www.domainname.com" and linking to the domain itself?

I have done quite a few researches on this issue and the general conclusion is these don't help, but they don't hurt your rankings either. I wanted to hear from the SEOMoz community about it though.

My opinion is Google doesn't take them seriously and we shouldn't worry about them, try to take them off and we should simply work on our content, guest posts, produce our generally great deals on our services and move on. Thanks!