[vshade]

I use the favorites to mark something to read later, it means that I'm interested in some link that was posted but I wasn't in conditions to read at that time. The OP service is spammy but no one told me that the favorites should only be used in the way you describe.

[moskie]

The scenario you described sounds like exactly what I said, with different words. You, a living, breathing person, saw the tweet, enjoyed it to the point where you said you want to check it out later, enough such that you decided to favorite it.

edit: The main point being that the intended purpose is to communicate that an actual person actively read the tweet, and for whatever their reasons, actively decided to favorite the tweet.