Yahoo! (NASDAQ:YHOO) is making good on its promise to better engage mobile users, Fool contributor Tim Beyers says in the following video.

You might not know it from coverage of the third-quarter report, which focused on the prospects for a tailwind from a forthcoming IPO for China's Alibaba. Yahoo! owns a reported 24% stake and has no plans to trim back.

That's a nice potential catalyst for current investors, Tim says, but there's also much more to the Yahoo! stock story. Q3 saw the company serve 390 million active mobile users, up 15% quarter over quarter and nearly double its January total. A $1.1 billion deal for Tumblr may be having precisely the impact Yahoo! was hoping for, especially since the blogging network has proved to be popular with mobile users.

What should investors watch next?  Should you be more or less bullish on Yahoo! following the Q3 report? Tim answers these questions and more in the video, so please watch now, and then leave a comment to let us know where you stand.