say I have a twitter account linked to an info website. say for example the site is about horses. If I then start following everyone who mentions horses in their tweets, then add them to a list called "horse lovers" or something... is that spam? people might not check to see whos following them, but they usually notice when they're added to a list. is there some rule against this or will it not work for some reason? if I don't use the account to spam out links, will this even be viewed as spam? sorry I'm just starting to play around with twitter so sorry if this is obvious.