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Marissa Mayer's company has been waving its checkbook again, adding yet more talent and technology as it continues to revamp and refocus on features. This week's acquisitions include photo app maker GhostBird and conference call company Rondee. 

Welcome to the Conference

Hot on the heels of recent acquisitions of Summly back in March and more recently Tumblr, Yahoo still isn't finished burning up the cash as it continues to expand its feature offering through investment. Rondee has been helping provide low-cost tele-conferencing services since 2007 and has been snapped up for an undisclosed sum.

The existing service will be shuttered in the coming months, with the current team likely to end up working on improving Yahoo's mobile or unified communications play as part of the small business team. With Google, Apple, Facebook and Microsoft all coalescing around their own single point of contact, Yahoo is lagging behind in this aspect and, as it has tightened up many of its offerings, may have something slick, like its recent tablet email app revision.

Taking Snaps of the GhostBird

GhostBird has been developing a number of mobile apps for photographers, with products including PhotoForge (an iOS image editor) and KitCam (a photo app with white balance, exposure and focus controls).

Those apps have already vanished from the Apple App Store. Key features from them are destined to be folded into Yahoo's Flickr service, which underwent a serious upgrade last month. With the mobile photography market highly competitive and Apple improving its own app in iOS 7, and both Samsung and Nokia bringing optical zoom smartphones to market, Flickr will need every trick it can get to remain competitive.

All of this business sees Yahoo continue to cheery pick useful products, features and talent as Marissa Mayer continues to invest in improving the company's image and fortunes. We'll see if any of this effort is having any impact in the company's next earnings call, due around the middle of July.