You can like a story on Instagram by simply tapping the heart icon that appears on the story or double-tapping anywhere on the story. Sometimes, if you're using the app for the first time, it might take a moment to figure out, but it's not complicated. Just look for those indicators and give it a click or a tap!
No. The idea of a 'dick contest' is inappropriate in itself and has no positive equivalent in Naruto fanfic. Naruto fanfics are centered around the world of ninjas, their training, battles, and relationships, which are positive aspects of the story.
No. Facebook and Instagram operate independently. Instagram has its own system for user interaction. Only Instagram followers can like Instagram stories. If you have friends on Facebook who also follow you on Instagram, they'll be able to like your stories there, but just being a Facebook friend doesn't give them the ability to like Instagram stories.
Well, I like an Instagram story when it shows something unique or tells a captivating story. Also, good quality photos or videos and engaging captions can make me like it.