Since Penguin update came out, many people have been saying that forum signatures are no longer relevant for SEO. Though i can't say for sure, I've heard that forum signature lines (links) were targeted as they are replicated from one post to the next and usually from one forum to the next. So in some ways, forum signatures could be viewed as link spam. I have read that these forum signature links are being discounted in relevance in search engine results. Though I believe there are some ways to get around this, maybe by varying up the content of the signature line from one forum to the next and not using the same anchor text in every forum signature line. So for example if you're promoting a kitchen cabinet site (or blog) and your anchor text on Forum A is 'buy kitchen cabinets', then the forum signature on Forum B could be ' kitchen cabinets reviews'. The point is to keep things changed up, not the same for all forums. Or, simply not attaching a forum signature in every forum post. And, most forums give you that option. Perhaps, just attaching a forum signature on the first post only for a forum would be enough to gain a reliable and relevant backlink. Rather than attaching the signature over hundreds of posts and then having them all discounted (as in not counted) for purpose of backlinking. What are your thoughts on signature lines for SEO? Are they still relevant for SEO? Do you still use them since Penguin update?