Tumblr has given Union Metrics the data it needs to introduce the first ever analytics platform for Tumblr, music to the ears of marketers using the site. The new tool will enable users to filter and track any blog or topic, summarize overall engagement and trends, and show the most popular content. The individual post engagement analysis is the feature to get excited for, as it will include a reblog tree visualization. Marketers will be able to see how posts spread through Tumblr. The relationship isn’t exclusive. The Union Metrics analytics platform is available by invitation only right now but will soon be opened up for everyone. (Econsultancy, AllThingsDigital)