It will also track how many shares your article got on Twitter, Google+, Facebook and LinkedIn. Additionally, it is possible to dig deeper and see the overall number of shares that have changed. It also allows you to track backlinks your article may have received and provide you with a so-called trust score in addition to a page score of the source of every backlink.
I just tried and its working fine from my end. When clicking on the link, you should be taken to the SEMrush page where you should be able to grab SEMrush pro account for free for the next 14 days worth $47. Please clear cache for your browser and try then. Please let me know if you still face any issue in claiming the 14 days SEMrush pro account for free.