Didn't know what post title to use but just as a disclaimer this is NOT one of these posts with step-by-step instructions on how to recover from the Penguin2.0 update. I'm going to compare the two main websites that I own, one that got tanked by penguin2.0 on May 22, and one that got boosted by penguin2.0 on May 22. 1) First site, got tanked(went from 400 visitors a day to 75 visitors a day from google on May 22) -Niche : health care and beauty, (multilanguage but mostly spanish) -Site : Dreamweaver static site with adsense, super light html code, loads super fast according to google speed testing. (88/100 score) -On-site SEO : lots of pictures with varying alt tags, videos, internal linking (this is where most of the rankings came from I believe), h1, h2 and h3 tags on almost every page, well-written varied title and desc tags. It's well-optimized, no keyword stuffing at all. Links to various authority sites related to my niche/topics as well. Site is about 120 pages. It is not geo-targeted and it is a .com The site has different language subdirectories that are each geotargeted to their specific country (spain for spanish, brazil for portuguese and so on). It's a .org -Off-site seo : two or three good, related high-PR links + a couple thousand scrapebox comment links (edu sites and PR 2+ pages only, NO keyword anchor text, just names). Yeah dumb I know that was my first site and I didn't know better. A couple social shares and likes, nothing impressive. Authorship set-up. 2) Second site, increased in rankings (went from 400 visitors a day to 600/day from google on May 22 -Niche : fitness, nutrition, supplements, bodybuilding (english only) -Site : wordpress site with adsense ads running on genesis + child theme. Kinda slow according to google speed test (65/100) -On-site SEO : same as site #1, very good on-site SEO with pictures, videos, link to authority sites, internal linking, etc. Site is about 40 pages. Off-site SEO : no link building done at all, except for one PR link with random niche-related anchor text). Decent social signals, lots of people liking my posts in facebook and getting good traffic from that. Authorship setup. By the way both sites have similar bounce rates Looking at that, the only thing I can think of that could be causing a drop in rankings for site #1 is the spammy blog comments. They have normal name anchor texts but they're still on massively spammed blogs. If all it takes to tank a site is load up scrapebox and let it spam a site for the night then this is very scary. Any ideas on what could be causing the problem?