Andrew Boon
It's +OK and -OK. And this one is important, because "-OK" as I understand merely implies revoking of your previous +OK, not necessarily a change of opinion. I I understand people click "unlike" mostly when they want to unsubscribe from updates, or clicked Like accidentally, while unlike SOUNDS like they don't like it anymore.
the -OK sounds great. Thanks
Maybe consider:

"Feel" when it comes to Comments, Blogs, Notes, Status Updates, etc. - provides an emotional response "I feel the same way about his comment, blog, note, status" +5 Feel this comment

"Track" when it comes to Groups, Events, Images, etc.- non emotional response to a group or event such as Andrew Boon is Tracking Austrailian Meet Exporters. Or Andrew Boon Tracks Autrailian Meet Exporters 2011 Expo.
If you're a student and need to get information on a assignment you have to complete you'll want to subscribe to that information however it's based on a topic you don't "Like"

I like the idea of a slider mentioned by DosDawg.

Slider Value:
0: -Ok (Not yet subscribed nor liked)
1: Subscribed (Subscribed to content)
2: Like (Likes content)
3: +Ok (Like and subscribe to content)

3 screenshots here

-Ok is good cause you're stating that you don't like see more and don't want feeds on such content.
+Ok is good cause you're stating that you do like and want to subscribe to such content.

But it's important that you don't force a subscription to someone who doesn't want to subscribe but just likes the content.
This is hence the reason for the Customize option
Below is the legacy version of the Boonex site, maintained for Dolphin.Pro 7.x support.
The new Dolphin solution is powered by UNA Community Management System.