Quup is described as 'What is quup?' and is an website in the Social & Communications category. There are more than 50 alternatives to Quup, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Android Tablet. The best alternative is Diaspora, which is both free and Open Source. Other great sites and apps similar to Quup are Facebook (Free), Tagpacker (Free), Friendica (Free, Open Source) 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.
Friendica is a distributed social network application. Which allow users to connect with others via their own Friendica server, but may also fully integrate contacts from other platforms including Twitter, diaspora*, Pump.io and StatusNet into their 'newsfeed'.
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.
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.
Social networking in a box. Build a social network for your company, school, sports team or niche community all based on the power and flexibility of WordPress. Install BuddyPress directly through your WordPress dashboard plugins page, or download it manually from the WordPress.
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.