Stalking is collecting any information, that either by itself or combined with other information can be used to identify someone with reasonable probability. IP addresses, browser/device details (fingerprinting, etc), usage patterns can fall into this category.
By that definition, literally everybody in real life is stalking me just by seeing what I look like. That's not a terribly useful or reasonable distinction.
Your analogy would be more accurate if they were logging/taking pictures of what you look like, and that can actually be considered stalking in certain countries.
Seeing the information is one thing. Collecting and storing it is another.
