Thanks all for the information. It was actually not that reassuring, as I'm using a computer at work, and it looks like at least my company name can be determined. (I tried some of the links above.) So if the person knew or could find out where I worked…

There are also other sites I've (completely innocently) gone back to a number of times. (Just topics of interest, such as music, not people of interest). It looks like if you do this too many times with some sites, it sets up a security alert with your IP address.

But this was all very informative. I never assumed I had ultimate privacy, as I figured there was some ways to trace anyone. The question was whether the average individual could and would bother to investigate specific visits to this degree. (I wasn't sure how difficult this was.) Since I can't know this, I will probably be more careful about this is the future.