Most of my sites got a boost from Penguin, except for one. (I've never added more than 30 or 40 inbound links in a month to a site.)
But I am surprised that the site I did the most link building with rose in ranking with Penguin, while another that I did less link building with, crashed. It was a general half page loss for many keywords, along with major crashes for two keywords - specifically keywords that I use in link text...
The loss dates are perfect for Penguin.
About a year ago, the site did get hacked and hundreds of pages were added. I suppose there could have been some bad links added from that, though I cannot see them in GWT.
It just doesn't seem like the site should have taken the hit from Penguin. Is it safe to continue link building embedding keywords in the link text?