Arg! Facebook strikes again, i.e., it's just another day. I thought I was accepting friend requests when, in fact, I was clicking on friend suggestions and ended up sending out friend requests.
It's not a huge deal since they were people I know. My usual practice is to just receive requests. Then, if they are from folks I know, I'll usually accept them. However, I rarely send them out.
The moral is, always pay attention to the labels. Yes, they are clearly marked, actually.