Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
UI Movement - The best UI design inspiration, daily
Diaspora - The online social world where you are in control.
UI8 - Carefully crafted UI design assets
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
UI Garage - Specific mobile and web design patterns for your inspiration