Musteus is described as 'A social media for a user friendly communication' and is an app in the Social & Communications category. There are more than 25 alternatives to Musteus for a variety of platforms, including Online / Web-based, Android, iPhone, iPad and Android Tablet. The best alternative is Twitter, which is free. Other great apps like Musteus are Diaspora (Free, Open Source), Facebook (Free), Pinterest (Free) and VK (Free).
Facebook's mission is to give people the power to share and make the world more open and connected. Millions of people use Facebook everyday to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about the people they meet.
VK (originally VKontakte) is a largest social network service from Europe. Available in many languages and highly popular particularly among Russian-speaking users around the world, especially in Russia, Ukraine, Kazakhstan, Moldova, Belarus, and Israel.
Ello is a simple, beautiful, ad-free social network created by a small group of artists and designers. We originally built Ello as a private social network. Over time, so many people wanted to join Ello that we built a public version of Ello for everyone to use.
Okuna (formerly Openbook) is an open-source, zero tracking, zero spying, zero advertisement, secure social network that gives 30% of it's revenue towards making the world a better place, now and forever.
Scuttlebutt is a protocol on which many different kinds of apps can be built. As for the social network, there are many clients, just like there are many Twitter clients. It doesn't really matter which one you use. They're all talking on the same network.