i'm new to instructables and i was just wandering what it means to subsribe to someone?
It means that you get notified every time that user publishes an Instructable (including slideshows, videos, or guides) or creates a new forum topic or Question. On one of your profile pages, you can see a compilation of your ~~targets'~~ subscribees' I'bles, forum topics, and even all of their comments.
As MacLean said, if there's a user whose creations are of interest to you, subscribing allows you to keep track of what they are doing publicly here on I'bles.
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Helps you keep on track of what their doing
it keeps you informed of the things that person does - in this case I believe it mostly shows you what ibles they put out.