You have to really screw a conversation to have no likes.
i am very thrifty with pressing the "like" button in forums like this.
it
can make sense to express "i agree, i would have said the same" (i.e. upvote that
one answer of which you think is the only right one among many posts to support the questioner) or eventually say "thanks" when someone obviously put a lot of effort into whatever.
but imho people tend ot overuse things like that, and for example
always give a like when a post seems to be constructive, clever, funny, arbitraring disputes, the first post of a new user and so on, and sometimes also only because the weather is good. then it stops making sense because it simply says nothing.
i always compare the situation with giving tips in gastronomy. unlike in the US, in germany the "official" rule about tip is that you only give tip to waiters or other staff members for extraordinary extra services, but in practice almost everyone who can afford it gives like 5-10% in order to not stand out unpleasantly.