On the other hand, it can prevent threads growing to a daunting size ('I haven't got an hour to spend reading all those pages' I sometimes think) with lots of posts quoting another post and adding 'Well said' or 'I agree' or 'Quite right'. If you want to express agreement with someone's point of view but have nothing to add to it, it's a space-saving way of doing it.Joining this a little late, and I admit I haven't read every post.
I occasionally go onto EDC Forums, they have a "Like" button. It really annoys me that people can nip into the thread and "Like" your post, without any explanation why. Though I suspect there are plenty there who enjoy the **** licking.
It's lazy and a thread killer at times. Ticking a box hardly makes a forum, by definition.
Just my two pennyworth.