I wish that you elaborate further, since this is a concern.
I won't name names, or dot any i's, but there are those among us who feel that the very concept of a smiley face, which is supposed to indicate one's tone, is a symptom of a decline in writing skills which they find degrading. These people argue that one should be able to make one's tone quite obvious by one's choice of words, and if you can't do that, it means you are a crappy writer.
Of course, one must also consider the reader. He or she might very well be a crappy reader, and will interpret one's jokes as solemn professions of belief.
But the purest artist--you are an artist, I believe--is the humorist who laughs silently at his own jokes.
However, some people can be guilty of being half-ironic, of playing both sides of the fence, not making it clear when one is joking and when one is not--and these people are, in my view, evil. That's the worst trick in the world--and the most cowardly.
So, as you can see, this issue of smiley faces is controversial and admits of no easy answer. I just wanted to let you know it is an issue.
"Turning out pigs for creationists makes me blue and blurry."--Brad McFall
™ Version 4.2