To me, "support" means you get to matches, obsessively read forums, have dreams about whoever it is that is heating up the transfer rumour mill. (I fucking swear I dreamed that I read on here that Isco was done and to us and actually thought it was true for the better part of the next day.)
I just can't see anyone having the time or emotional room to devote themselves to "supporting" more than one club that way.
So for me the only club I can even support is the one I have since just before Alan Ball right fucked us up. Bad timing, that, but it worked out okay in the end :)
I do like certain other clubs and want them to do well: Spartak Moscow to show respect to my Russian relatives who go WAY back with them. Bordeaux in France from living there for a while. Now living in the US and will pay more than a little bit of attention to NYCFC.