So, it went viral. Everyone's talking about it. No one will shut up about it. The novelty is over, and the backlash has begun.
Perhaps you never cared whether #thedress is #blueandblack or #whiteandgold; maybe you had initially been interested, and now you'd rather bury yourself in the warm folds of CPAC minutiae. Here's how to block hashtags and topics.
Facebook: At the top right corner of a post, click the down arrow and select "I don't want to see this." Facebook's mysterious algorithm will begin to eliminate similar posts from your News Feed.
TweetDeck: In the left rail, click the gear icon and select Settings. Click Mute, and enter your hated phrase or hashtag. Click the Mute button to confirm.
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Mobile and desktop: There doesn't seem to be a way to mute specific words or hashtags in Twitter's native apps -- you can only mute specific users. Third-party apps or browser extensions like Tweetlogix and Open Tweet Filter say they'll do the trick, though.
Last resort: Direct aggression toward those who are jumping on the hashtag bandwagon. Outcome not guaranteed.