Many of our clients ask if they should buy links to improve their SEO. The long and the short of it is, never buy links. Almost all the links that you will be offered to buy will be from disreputable, spammy, shady and social networking sites. When Google looks at these links for ranking it is like having a reference letter from a local drug dealer. Or going to your dream job interview with a letter of recommendation from Rob Ford. It may sound good in theory but it will more than likely hurt you site ranking not help it.