Suggestion: Exclude filter

I like the idea of the 'exclude' filter, but it would also be great to have a 'negative exclude' filter. In other words, instead of only showing posts with the filter word, it would be great to exclude posts with a filter word, perhaps preceded by a "-", as in Google searching.

For example, if my filter was "-flickr" (without quotes), then items with the word "flickr" would not be passed through to Twitter.
 
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