The best tool I know for tracking links and web popularity

Ahrefs has the biggest database of backlinks that I know. Minimalistic interface and lot of cool features make it really useful tool. We used it to track content of our blog Funders and Founders, for our new product Adioma. We even made the infographic based on Ahrefs dataset, using number of back-links and referring domains, as counted by Ahrefs. For each top English-language media website in the world, we found the most shared articles using Ahrefs Content Explorer. I used to use Yahoo Site Explorer and Google Webmaster Tools for tracking links, but Ahrefs makes it much easier and useful. Highly recommend to everyone who is growing their website audience.