I would like to include some text at the end of every post. Like how some people write "Like my posts? Follow me on twitter!" or something like that. There are some buttons for users to tweet or share the posts, but I want to see how people would respond to explicit suggestions.
I thought maybe I can just copy-paste it over and over again, but if I ever decide to change it, I'd have to update every one of them, so that isn't a very scalable solution.
I also have existing posts that I wish to have this text appear.
I'm thinking of changing the theme so that each post has the text, but that doesn't seem like a very "wordpress" way to do it.
What is a good way to accomplish this? Being able to choose which posts have the text or not (eg: based on category, tags, etc.) would be nice.