Twitter and Facebook will bring you traffic and help to build an active, passionate community. Sharing your content across multiple social networks brings you a steady stream of traffic. Traffic from a diversified source and not just organic search engine rankings. Being visible on Twitter and Facebook strengthens your branding, builds trust and credibility. Google's algo ranks you higher when you show regular social proof (tweets, likes and shares). Google's algo ranks you higher when you have a strong brand. As you can see, having strong Twitter and Facebook profiles are not just about traffic, they also build credibility and trust with your audience, while Google rewards you in the SERPS. Google vs. Twitter vs. Facebook Many people look at Google, Twitter and Facebook as independent sources of traffic, where you can just concentrate on one. You can focus on just one, but the real benefit comes from utilizing all 3 at the same time. It is a much more efficient way of thinking of traffic generation... When you combine Google, Twitter and Facebook its not a case of 1+1+1 = 3 Its a case of 1+1+1 = 10...the results are exponential (and extremely beneficial)! That's because they all leverage off of each other and the results are multiplied many times over: The greater the fans and followers on Facebook, the greater the traffic you will see. Greater traffic, improved branding and more social proof means higher rankings in Google and greater organic search traffic. More traffic in Google brings more fans and followers....and the cycle repeats, generating increasing traffic with each cycle. Its a powerful loop! With BIG benefits! Once your profiles hit critical mass the benfits keep coming as your profiles mature and reach their full potential...
Facebook and Twitter are really important nowadays since people are so much engaged to social networking. These two are good for communication.
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Many reasons are there but the most effective reason is, these two social sites are the dominating websites as social networks is current era and is able to create huge traffic of regular visitors for your sites.