From the album: The Answer
The quickest way to put a fellow forum member on ignore is not to actually visit his/her profile page, but simply:
find a post, or activity stream entry, in which his/her profile photo (or tile) appears;
hover over the profile photo, without clicking on it, and wait for the profile ‘speech bubble’ to appear;
click on ‘Ignore user’, which then takes you to your account settings' Ignored Users page, with the user's name already filled in;
select the categories you want to ignore for that user; and
click Update Preferences.
There is no equivalent shortcut on the user's profile page.
© A Smug Dill