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Currently user are forced to management content by hand. We have 21 century and user must copy text and paste it into some directory, then connect with activity.

Idea is about keep hidden directory for each tag and activity, where will be placed symbolic links to some content (I describe this later).

When user right click on selected text/image/something, he/she could click connect with tag or add to activity. Then select tag/activity. New file will be created in some hidden place + in symbolic link to newly created file in tag/activity hidden directory.

When user decided to untag/deactive content, he/she right click on it in tag/activity view (folderview or something) and:
1. Could deselect tag/activity (if this file have link in more places than one), so file would be unpin from it
2. Could select remove (if this file have only one symbolic link)

What is benefits? User do not have to copy content into some directory. Do not have to open kate to paste text into it or copy text/image and select paste content in dolphin. It is much simpler and faster.