Filter: history and tooltips
History of the last used (and possibly some more) filter terms or expressions.
Tooltip for the most common expression keywords.
I was also thinking of maybe a save filter option? There is a lot of stuff that pops up in the feed that I don't necessarily need to tag, but do like to often filter it out.
I would prefer a dropdown with the 10 last used filter search phrases and in addition an autocomplete feature based on the last 1000 (?) search phrases (comparable to a search field of an search engine).