Why would someone bother with temporary link from link exchange services and pay monthly fees is beyond me. Wide Circles offers virtually permanent high PR links, it is up to you to choose how high you need to go, whether you need dofollow or nofollow and how you wish to control the other settings. Natural link growth built by humans not automated processes, shows you how easy it is to rank high once you have the proper formula setup.
This is why Wide Circles wil remain number one service for link building, other services may offer monthly fee links, brokers and so on but do not come close to what WideCircles has to offer. Their system is truly unmatched when it comes to link acquistion and building. I would recommend you give it a try and go over it with a professional to confirm how well it can work for your site rankings.
WideCircles or WideCircles keeps innovating and this is not the last we have seen from them, human based approach, natural SEO combined with propriatery algorithms for analysis, distribution, filtering and many other things. Give it a try today, run a sample campaign with Wide Circles to see how well it will work for your site. Social media marketing has never been better then now with Wide Circles. Here is their website address in case you missed it: http://www.widecircles.com