I am wondering if someone can educate me on how a certain web function is programmed into content. Here is the situation: I was visiting a Time magazine business page and decided to copy a couple of sentences to include in my blog (referenced of course). When I copied and then pasted I noticed that it automatically included a Read More link (includes full URL). So I tried it again this time with less than a full sentence and again the Read More link is included. I tried again with only a few words and this time no Read More link.
So my question, how exactly do they do this? I assume there is some minimum word count needed before the Read More link is included.