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1.
NSFT: Not Safe For Twitter. When a subject you want to tweet about is too inapropriate for your followers.
Guy: I wanted to tweet about the things i was doing to this chick last night but it was totally NSFT.
by walkofdoom December 14, 2010
 
2.
Acronym meaning "Not Safe For This Site", which means that the content that it is directed towards is not appropriate for posting on a website or forum within due to content regulations.
(In the case of a forum, say a children's literature forum) Dude, that porn link is NSFTS.
by Da Rabid Duckie October 25, 2006