Forums have a lot of outgoing links so the link value per link is devalued greatly. Therefore, not a lot of 'link juice' will be passed via links from forums. Many experts in the industry are of the opinion that forum signatures are of very little SEO value but that they're very useful for getting referral traffic, especially if from a respected poster. Well, I think you could do it, but don't centre your campaign on this method. Make sure you don't spam the forum (by not participating in it and then immediately plugging your business blatantly) and be sure that its niche is relevant to yours.
I'm new to seo too.But i am able to anwser your question! if you participate in forums like this to do that signature ,of course those counts as a backlink. And is it worth it to do so . Also do more quality backlinks to you site . Write some sensable articles!
yes, they count.. Try to post on websites in similar industries, this will help direct traffic as well as interesting backlink
it worth thats why most of the guys here paid lnks in there signature .. u can think how much it worth that some one is paying them to get his link in the signature
It is used for increase traffic, increase PR (pagerank) and shooting targeted keyword for their web so that web has good position at SERP search engine.