I would like to thank everyone who has answered my question. I joined HubPages six weeks ago, but the six Hubs I have written have all been published within the past week.
I didn't know what the "expected" protocol was when someone chose to follow me; that's why I asked the question. My feeling is that when someone decides to follow me, I should look at their profile and also see if what they write appeals to me. That way, I can make an intelligent decision about whether or not to follow that person. I don't want to be obligated to follow someone simply because they chose to follow me.
The practice of "if you follow me, I'll follow you" doesn't seem the correct way to go.