Hi graveny
Do you actively participate in those forums, or do you just drop in to leave a link suchas signature? Many forum operators remove link drops, even though it may be a few days before they do so. If a search engine grabs a forum discussion page before the link is removed, the link might remain in the search engine's index for several weeks or months, or only a few days, before it grabs the page again and removes the (now-vanished) link from its database.
Forum links are not considered good for SEO purposes
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