In ordinary conversation, "friend" is as acceptable on DW as on LJ. :-) You're right that "subscribe" is the label on the links and in the FAQs on DW.

I'm on both (user name="brightknightie"> and <user name="brightknightie" site="livejournal.com") platforms; please feel free to friend or unfriend as you like! If you're at all likely to ever chat about FK on your journal, I'd love to friend you back. FK and FKdom have always meant a lot to me. The monthly round-up posts (tagged "recently") are the least I can do. :-)