Nick Drewe is a writer and programmer who examines social networks and he has compiled a list of banned and restricted hashtags on Instagram. Some of them are obvious (#instasex), while others will make you scratch your head and wonder #why.
“Instagram appears to have changed the way it censors hashtags now,” Drewe explained to The Huffington Post. “There are two levels of censorship. Hashtags can either have an outright block, and return no results, or a sort of ‘soft,’ often more temporary censorship with around 30 results.”