yeah this one should be fun..... because it seems that not only are you seeking something expressed and universal, but you are trying to bring to entities together, that may not actually mashup.

why not consider dumping what has been, and just create your own acronym or pseudonym.
drop off of what has already been established, and come up with uniqueness.....

i had just submitted this, but thought of something, as i was about to close the browser.

a sliding scale which could at one end, see more have the + or 100% which 100% could also be utilized for follow or track, but not necessarily depict your favortism, and it could be named Interest Scale

so at one end, would be 100% which would also provide for a track
the other end could have -100% and indicate either a dislike or non-interest in the subject or topic.

so on the rule, you could at say some point, establish something around +80% enable the follow marker
on the other end, -80% would indicate 0 interest and not necessarily declare that you dislike the matter, but just have no interest.......

oh well that was my fleeting thought....

yeah this is a good one......