Yahoo CEO Marissa Mayer has been on a shopping spree lately.  Since she took over Yahoo she has made a number of acqui-hires including Stamped (a mobile-review app maker), OnTheAir (in broadcasting video chats or interviews to online audiences)  Snip.it (clipping service for the web), Alike, Jybe (a social recommendation site), Summly (a news condenser app maker), Astrid (a task-management app), GoPollGo, MileWise, and Loki Studios (develops games based on user’s location).  Most of the deals have been under $30 million. Now Mayer has set her eyes on Tumblr.  Tumblr was founded in 2007 as a micro-blogging service.  Tumblr has raised $125 million from investors including Spark Capital, Union Square Ventures, Sequoia Capital, Greylock Partners, Insight Venture Partners and the Chernin Group.  Tumblr now has a reported valuation of $800 million and Yahoo’s current offer is $1.1 Billion in cash.  Mayer believes this acquisition is vital to turning Yahoo into a more mobile centered company.  Almost ...

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