Facebook has a huge worldwide user base of 500 million-plus, and a partnership there could increase the amount of calls flowing across the Skype network. If Skype ultimately decides that its future does not involve going public as a separate entity, becoming the captive audio and video calling service for Facebook's massive user base may make a lot of sense. And of course, the two are already quite familiar with each other.
But if Skype decides to stick to its initial public offering guns, a money-making tie in with Google would lift its prospects in the business arena while also helping Google in its cloud business suite battle with its rival in Redmond.
The biggest reason for Skype to go with Google may be for its own business reasons. While both Skype and Facebook have massive user communities, neither has put together a business plan the way Google has. Skype has put off its initial public offering in the bid to go public, but as the Reuters article points out, the clock is ticking on Skype strengthening its pitch to Wall Street.