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And if i did get penalized, how can i fix this? What kind of link building can i concentrate on now?

I'm not 100% sure of the latest follow vs nofollow ratio guidelines, but running your homepage URL through OSE suggests that maybe too many of your top links are nofollow (18 out of your top 50) - most seem to be fairly spammy blog type comments. Perhaps try and target less spammy links? Just trying to be helpful, please don't take it the wrong way. Brad