like I said - its 2013.
The one thing anyone who knows anything about SEO knows is that last year Google made it very possible to hurt your site with spammy links. One of those kinds of spammy links is forum signatures.
Its amazing but there are still quite a few people who show you that they do not know what they are doing by running around in forums (this one included) dropping posts with a whole list of keywords in there signature trying to rank. Simple equation
People stuffing and spamming keywords in their signature = people who do that do not have a clue about SEO in 2013
and as far as knowing anything should just as well be posting in the off topic forum because whatever they are saying - its has nothing to do with good SEO.
Good SEO and keyword in forum sigs - red alert - no know SEO
There I said it