My suggestion:

Create a filter that user can edit, in this filter user can add:

1. Words (in notes or user name)

2. Hash tags

If you can ... Make filter and block list process before display in "viewer area", sometimes app crash because it's going hide all user posts you have blocked, but the list scroll down showing the "hide" action.

This is a simple blocklist, but I think that it's a big helper. Hope you enjoyed the suggest. Thanks (sorry for my English).