Social Media for Everyone
Facebook, Twitter, LinkedIn and Blogging why bother?
If you have something timely and relevant to say, then you should be using social media. Do not use it if you are not going to invest the time to use it regularly and respond to your "friends".
Links from your website to your social media sites increases your rankings in searches. Links from social media to your website are often ended with the <no-follow> tag, so they do not effect the search engine ranking.