this will increase your back links mostly and people will Know about your site and you get more info about social media and web development

We Get Permanent Backlinks for our websites for it's Keyword ranking

Forum postings provide an opportunity for getting knowledge and improving it through discussions. Signatures in forums are good back links to your site and its reference.

Forum Posting create permanent Backlinks And also Improve the Keyword Ranking.

Gain backlinks and engage with other bloggers => more traffic.

If your forum is high quality and truly provides useful content, visitors can get very focused on it, checking in every day to learn more, ask new questions that arose and connect with their virtual friends.

Forums are also used for direct marketing of products as you can market your products or product page in certain discussions where other users are asking for some good products and providers of certain kind.

Forum Posting is the best place to get connected with many other bloggers and website owners from around the word. You will get traffic, Back-links, Best Answers to many questions.

forum increases the traffic for the site

If you answer continually on Forums it will give you a lot of benefits to your knowledge and your business.

Advantages of Forums in SEO: Forums assumes a powerful part in SEO as its an Off-Page SEO system. On the off chance that you have utilized appropriate mark for your site, then crawler will list it and it will help in enhance the site rank on internet searchers.
In another way its knowledge sharing platform.

It helps making high quality backlinks.

Main benefit of forum posting is that you can add links through signatures that are added at the end of your comment but in some forums, to make signatures that contain a link with a keyword, you need to earn a certain level of reputation. Once you reach that certain level of reputation in a particular forum, you will be allowed to add signature. A signature in a web forum is a kind of sign off that will automatically appear at the end of each post made by you. You can include backlink to your website in that signature so each time you will make a post; a live link is made to your website from that site. So forums create backlinks in a big number easily as the more you post the more backlinks you make.

By Forum posting, you have increase your back link quantity.

I am definitely agree with you. Forum posting is good for rink building but I have question is it helpful to rank keywords or not. Most of the people says that Forum Posting give spam results for Keywords, what you say about this.