I've read so many times from so many people that you should get nofollow backlinks in your SEO campaign and mix them up with your d0follow so you don't 'stand out' or get 'flagged' by Google. This is complete BS! 90% of backlinks online are d0follow as stated in a video from Matt Cutts so having only d0follow backlinks is not only fine but more than expected. So, having a campaign of only d0follow backlinks is fine if you wish to go dow that route, don't let anyone tell you its 'dangerous or not recommended for getting flagged. However, on a side note, I do myself suggest you to use some nofollow backlinks. Even though nofollow links get no juice there are plenty of sites out there that will get you direct traffic not to mention the credibility on sites such as wikipedia, aboutus and others that I recommended you to try and get your sites onto. At the end of the day, I will only spend time on quality nofollow backlinks unless its automated software that gets the nofollow links without wasting anytime. Just my piece and my first thread here I believe. Have a good one!