I know people who toy with others feelings, both online and IRL, and they are in no way sociopathic, they are just seriously immature. Think '10 yr old on the playground, trying to get attention' type mentality. And they won't get a lasting relationship out of it because they don't WANT one. They want to play. If someone expresses hurt, their reaction is to be upset and embarrassed "I didn't mean it that way! Why are you yelling at me? I just wanted some fun!"
The article does not seem to make this distinction. It lumps all the jerks together into one convenient label. Yes, there are sociopaths on the net. There are also garden-variety jerks, immature people, drunks, druggies, and all sorts of other 'winners'. You should be careful of all of them, but panicking over possible sociopathic tendencies is not a good way to go.