Tilde Friends does not collect any data beyond what is willingly provided to it. There are no analytics, telemetry, or trackers.
Any data stored in Tilde Friends by any means, including manually entering, using a Tilde Friends app to automatically post, and linking external accounts will be published to followers in a manner appropriate for the Secure Scuttlebutt social network.
In other words, you are in full control of what happens with your data, and Tilde Friends is a means of publishing it, either privately or publicly.
Any questions can be directed to the developer at privacy@tildefriends.net.