The most popular app for video-conferencing via desktop and mobile also has an instant messaging feature that can be used as a replacement to Whatsapp. It is only an unfortunate coincidence that the app, which is easily available on all platforms has a lower preference rate when it comes to text messaging.
The app has a lot of features, complete with stickers, emojis and GIFs. What really brings the app down, however, is its association with paid calls for a service that is increasing becoming more and more free. And while it has the largest database, people are generally apprehensive of sharing their personal contact info (such as emails and usernames), as compared to apps which use mobile numbers.
Who owns it? After having changed ownership several times, Skype is now owned by Microsoft.
Users: As of 2010, Skype has 663 million registered users, with 280 million monthly active users.