
#thinspo: Instagram has also moved to discourage users who promote eating disorders as a weightloss inspiration, under the #thinspo tag. Other banned thinspo tags include #thinspiration, #loseweight, #proanorexia, and #probulimia.
Both Tumblr and Pinterest have moved to restrict those tags on their platforms.
#whitepower: Also banned are words that reference racism, like #whitepower. Clearly, Instagram is hoping that racist accounts — or knowledge of them — don't go viral. The n-word is also banned as a hashtag, but not if you use it as part of your Instagram username.
#popular: Instagram has also banned searches for terms that might be used by people trying to game the system in a quest for building massive (but fake) audiences: #photography, #popula,r and #popularpage.
And then there are real some real head-scratchers. While some of these hashtags do contain four-letter words, it's not clear why Instagram thought they were so threatening, or so negative, that they needed to be restricted:
#DuckDynastyBitch
#f---youhitler
#f---psy
#thesexpistols
#beautyandessex
#iphone
#iphone4s
#iPhone5 is, however, searchable on Instagram. You can use Statigram to find more unsearchable terms
Read more: http://www.businessinsider.com/banned-instagram-hashtags-2013-8#ixzz2imi8KZLl