I think I've been spammed.
I just opened my "you" page and was pleasantly surprised to find a new subscriber. When I clicked on the new avatar, I found what appears to be a page dedicated to the promotion of a product called Sakrete. This is also the username of my new subsciber, and the sakrete logo is the avatar. Anyone else have this on their page? Please do a member search for Sakrete and tell me what you think.

















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Some members use the site as a (not very) subtle way of promoting their product.
What you saw was Sakrete's member page, because all their published instructables have been on how to use their product.
You could interpret that as "spam", except that you can follow their instructions when using materials from other suppliers.
I can think of at least three other reasonably-active members who are also companies - an LED supplier, a paper model maker and a silicon-rubber manufacturer.
That's fine, because they don't plaster adverts everywhere, and they also give useful advice to other members, which Sakrete's comments show they also do.
All of which is a ridiculously long way of saying; no, it's not spam, it's a subscription from a normal member.
>sigh<
Having someone subscribed to you doesn't affect your account at all (unless you click on their profile). They don't get any privileges to e-mail you, or rate your I'bles, or Feature you, or do anything else "special."