JPMorgan analyst Doug Anmuth views Twitter's Q4 results as mixed since monthly active users declined sequentially while revenue was essentially in-line and EBITDA beat expectations. The MAU decline is disappointing, Anmuth tells investors in a post-earnings research note. He remains positive on the stock, however, saying Twitter's platform is differentiated and that product improvements can drive broader engagement and monetization over time. The analyst cut his price target for the shares to $26 from $46. Twitter is trading down 7% in the pre-market to $13.95.