The Twitter Fav. Pronounced “Fave” (surely? Surely not “fav”?). It’s the dry hump to the Retweet’s coitus. Like passing someone in the street that you know and smiling at them instead of stopping to chat. The Twitter equivalent of being friendzoned.
A while ago the excellent @death_stairs listed the different types of Faves/Favs. I remember thinking there were a few you could add (that’s a classic Twitter behaviour pattern right there. “I know I can improve on your joke”). As time has gone on, Twitter has changed and the Fave has evolved. So here’s an updated list by @pandamoanimum and me.