Jonny was here <a href=" http://www.minag.gov.mz/index.php?purchase-premarin-online.pdf#backup ">buy premarin online canada </a> Ms. Mayer's blockbuster acquisition of Tumblr, which has more than 100 million blogs and generates very little revenue, also is a risky, long-term bet on introducing a younger demographic to Yahoo's services. Some analysts and tech-industry observers say Tumblr's value was falling, not rising, when Yahoo bought it.