This is a poor signal, at least in my experience. It is possible that no one looks at my profile, but I have a semi-famous acquaintance (we've had dinner but not at one's house) and 80% of my friend suggestions are 1 mutal with that person.

I do interact a lot so maybe people click to see if I also look touched? Either way I have a unique enough name that I'd notice if anyone was viewing my profile via that side-channel.