Since Windows is still the dominant platform, Skype is available on most platforms, and FaceTime is only available one Apple devices, Skype is very common. As a result, many Mac users have it. We might use FaceTime most of the time, but once in a while, you might want or have to video chat with someone who’s using Windows, Linux, or Android.
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Most folks are on metered data plans and video chatting can use use up a significant amount of data, so video chatting on a cellular connection is inadvisable in general, regardless of how many people you’re video chatting with.
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I agree, Skype is a crappy application. But unfortunately, it’s the only one that can be used Mac, Linux, Windows and Android. A lot of people are still using Windows and Android. And then there are some folks who are using Linux. You can’t just use FaceTime with everyone. I’d prefer to use FaceTime for all video chatting, but unfortunately, I have to use Skype to video chat with Windows users. A lot of Mac users have Skype on their Macs because they occasionally want to or have to chat with Windows users.