Maybe this will clear it up:
Tag Surfer (now accessible on the left of your screen under the "W" favicon) is now called "Read Blogs." It automatically contains a list of the tags and categories you use on your posts.
When you click one, you will see an infinite scrolling page of posts made by other bloggers with the same tag or category. (Note: if you use this feature, you can modify the list for your own reading pleasure)
Your posts are automatically added to the "Read Blogs" (Tag Surfer) whenever you add a category or tag to a post. Your posts are also added to WordPress' global tags
( http://en.support.wordpress.com/global-tags/ ) but from there people must click the summary of you post to get to your actual blog to read it all.
People who use this feature do not have to visit your blog to read the post, nor does he have to visit to "like" the post.
If you turn off "likes" it only means that you are not displaying "likes" to your readers. You cannot prevent folks from "liking" your posts—you only choose not to show off.