I do have a (pedantic?) suggestion though, I'd personally enhance this:
... +1 or the word like as the text of your reply...
... +1 or the word like as the only or first line text of your reply...
The only reason I suggest that is to head-off anyone possibly inserting the +1/Like into any other position, which I don't know if it would work; I didn't test that but I suspect it probably won't*. When I did my two like reply tests, I did not trim the quoted text (on purpose) but I did place the +1/Like at the top. Someone may insert a +1/Like under a specific paragraph to indicate they like that part resulting in an unwanted message posted to the group, you never know.
* just as I was getting ready to click Send on this reply, it just occurred to me, I can use this reply to test if it works in any other position, hence these two lines: