The problem, as spelled out and punctuated in the blog:
I love it when it rains!
Note the exclamation point in the first example.I love it when it rains
After a brief discussion, blogger Kenna Griffin offers this "new rule":
When using an emoticon, you should use regular punctuation, followed by a space and the emoticon.And that means she prefers the first example above. In other words, treat a sentence separately from the emoticon that follows. Don't treat the emoticon as the concluding punctuation mark for a sentence. Makes sense to me!
Of course, in serious writing, emoticons do not exist.