Forum posting is one of the most effective way through which you can easily increase the visibility as well as organic traffic to your website:
But you have to follow the following rules:
1. Forum must do follow
2. Forum PR 3+
3. Forum must be well reputed
4. forum must have 10000+ registered members.
Google Panda and Penguin now days work together to remove the spam and low quality stuff from their rankings. Whereas Google Panda is specially design apply penlty on those websites having spam backlinks or from low quality website, you can also say that it is for Off Page Techniques. And Penguin is design to remove the anchor spamming or minimize the keyword stuffing effect. Its for On=Page SEO Techniques.
Link juice is the currency of Google. In other words, it’s the secret source that allows you to beat your competitors for rankings in Google. Sure, there are some other factors that Google uses to calculate rankings (see Search Engine Optimization), but link juice is by far the most important aspect of dominating Google and in order to understand Google, you have to understand link juice.
Profile increase the visibility of your website instantly but its on you that how you use them effectively, the link direct your website is placed in the bio with hyperlink code id rich with content. And its must to find the good websites first which are do follow as well as PR must be 4+