No, I use 4.0.6 so it's definitely there... It may only be there if you have Facebook Integration turned on- not sure... if you don't use the facebook like button there are alternate instructions listed...
Also make sure there's no spaces before or after "{vb:raw fblikebutton}" in your search... Look for this code before it:
Code:
<vb:if condition="$show['fb_likebutton']">