SNSに必要性を感じない。って英語でなんて言うの？

This kind of answer begs an explanation and is usually is followed by further reasoning, for example: "I don't feel I need social media, because I prefer to communicate with my friends by phone" "I don't use social media because I find it shallow and narcissistic"

Here you want to let the other person know that you don't feel the need to use social media, that it's not 'necessary'. While it may be important for others, it isn't 100% necessary for you to use it. Some key phrases to use and focus on are 'I don't feel it's necessary', 'It's not entirely necessary'.

When something is said to be Superfluous: this means it is redundant, unneeded... IE not required! Although many of us seem almost " obsessed with social media..." there is another "school of thought" that finds it "totaly superflous to requirements" "I have no time for it myself...Its not for me"

"I do not think using social media is important." This explains to the person that you do find it necessary to use social media. "I don't see the point of using social media." This is another way of explaining to the person that you do not find using social media important to you.

*I'm not interested in social media./Social media is not for me. Social media includes facebook, twitter, instagram, whatsapp. These are internet based platforms to communicate or send pictures to friends or family in different locations. Example Sentences: I'm stuck in the stone age, social media ain't for me. I think social media consumes ones time, I don't like it. Anyway that's me!

Explanation: A superfluous distraction is something which takes your attention away from more important things and perhaps slows down progress in other necessary projects. Example sentence: "As a dedicated pianist, I feel getting involved with alcohol would be a superfluous and possibly harmful distraction."

Something that is a necessity is something that is required and can not be done without. For example, we can not do without food because it is a necessity. Without food we can starve. If ,something does not seem necessary to you, it can be done without. So, in your case, you do not need to use social media probably because it's a waste of time. So you may say: I don't see the necessity of social media. or Social media does not seem necessary to me.