As Yahoo goes through with its acquisition of Tumblr, CEO Marissa Mayer may have a user rebellion on her hands. The early reaction from the Tumblr community is not encouraging — blogs lit up with memes of crying babies and apocalyptic rants upon the announcement of the news. The uproar was bolstered by stories critical of Yahoo’s earlier acquisitions, and fueled by rumors that Yahoo may introduce advertising to the popular blogging site.