If we post multiple posts in forums using signatures of my site does it harm or gain SEO? If it is harming SEO what is the optimum no of links we should have from each forum ? If any one have correct facts pls reply. Thanks SPH
For the most part signature links in forums do not carry much weight in getting a site ranked. Instead, you should use your forum sigs to advertise your services/products.
Most of the forums are 'no follow' and if you do frequent forums that are 'do follow' the significance attached to signature links are not much. It may however be helpful to increase traffic to your websites, getting your website cached more often, and advertising your website. However you should desist from spamming forums as you are likely to get banned by doing so.
It probably doesn't matter. I post in forums where I'm interested in the topic and I'm grateful for the referral traffic. I don't worry about whether or not it benefits my SERPs.
Posting in forums is a nice way to generate some short term traffic, although it would be the quality of your content that would turn any lurkers into subscribers.