I think that's a good idea. I've had the same thought as draconic_flare -- that "liking" becomes an easy and often meaningless gesture very quickly on social media sites, and as someone who's never received a comment on a fic, I absolutely agree with their take on kudoes on Ao3. At the same time, though, as someone who also frequently posts personal blog updates that don't lend themselves to commenting, it'd be nice to have a way to know someone is reading. And, <3 is a good alternative to a rather awkward kudo or like on a post about one's ongoing health problem or the death of a relative.