For our new members:
The giant smileys are a quirk of the forum software. They result when you type in a smiley emoticon; that is a : followed by a ).
You can obtain normal sized emoji by clicking on the “smileys” button on the bottom left when composing a post, and picking one’s emoji of choice.
Of course, if you like the giant emoji you are very welcome to use them. This is just to explain what is going on. I expect most are pretty surprised when the giant smiling face appears upon saving a new post.