Which Social Sites should I delete on my Overloaded iPhone?

Well… My iPhone4 has 73 Apps in it and I'm not sure which one to Delete among these social websites Please It's Serious! My iPhone hangs up a lot of times so I wanted to remove the useless apps… Please suggest me to delete the Useless and boring App among these I'd be thankful to you:
FACEBOOK, TWITTER, WHATSAPP, VIBER, KIk, INSTAGRAM, DECIDERR, WECHAT, LINE, SKYPE, YOUTUBE

Delete VIBER, KIk, DECIDERR, WECHAT, LINE. As the rest are most used apps

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