Back story. Known her for years to chat to etc. never socialised. She opened an instagram account and things started to get weird. She is putting up very risque photos of herself in scanty clothing which has got as far as the wet look vinyl gear think Ann Summers. Her 
hashtags have interested the weirdest men worldwide. The thing is some of these men are trying to befriend me. I would like to unfollow and block her, would this be an unkind thing to do. OH says wtf when he saw the pictures which we think her OH must be taking.