Mastodon

Mastodon is a decentralized, federated microblogging platform. It's made up of many instances, each with its own rules and focus. The instance my account is on is Fosstodon, a community focussed around free and open source software.
GitHub

GitHub is a code hosting service and collaboration platform owned by Microsoft. I host all of my projects on there and contribute to a few open source projects.
Discord

Discord is a social media platform centered around finding communities of like-minded people. I primarily am active in the Python Discord Server, but I'm in a few other linux ones as well. My username is Anonymous4045#9808.
Stack Overflow

Stack Overflow is a programming Q&A platform. I have recieved many great answers from there, and try to contribute some myself.
My email is contact@anon4045.email. My provider is Titan mail, which lets me use this domain for the address.