Post-Annotator/annotation stream: add simple filter "your annotations" and "their annotations"

I know you are still busy with some other (basic) things, but if we could manage to have a simple filter in the sharing update, this would help a lot (I'm sure this will be almost the first user feedback question: can I filter the annotation stream?). I'm not suggesting to implement a complex filter, but simply one like on the project or group page

This would already cover many use cases. I know it's probably a little bit more work, because we will need some kind of filter menu/overlay, but if it's somehow possible, it would be amazing.