Very interesting Lilly. Thanks for your post. Here is some information I found that I thought interesting. This goes along with what you posted about cyber bullying.
It is interesting to understand better those who are obsessive or use cyber bullying are often "deficient" in normal thinking and deficient in their lives. The whole article is exceptional and quite informative. One thing for certain: all obsessive stalkers are connected with a paranoid disorder. Many are delusional. The article even talks about "gang-stalking" which is very interesting.
This below is taken from here:
http://en.wikipedia.org/wiki/Stalking
Types of stalkers
Psychologists often group individuals who stalk into two categories: psychotic and nonpsychotic.[11] Many[quantify] stalkers have pre-existing psychotic disorders such as delusional disorder, schizoaffective disorder, or schizophrenia. Most stalkers are nonpsychotic and may exhibit disorders or neuroses such as major depression, adjustment disorder, or substance dependence, as well as a variety of Axis II personality disorders (such as antisocial, avoidant, borderline, dependent, narcissistic, or paranoid).
Some of the symptoms of "obsessing" over a person is part of obsessive compulsive personality disorder. The nonpsychotic stalkers' pursuit of victims can be influenced by various psychological factors, including anger, hostility, projection of blame, obsession, dependency, minimization, denial, and jealousy. Conversely, as is more commonly the case, the stalker has no antipathic feelings towards the victim, but simply a longing that cannot be fulfilled due to deficiencies either in their personality or their society's norms.[12]
Another part from the link above:
In addition, the personality characteristics that are often discussed as antecedent to stalking may also produce behavior that is not stalking as conventionally defined. Some research suggests there is a spectrum of what might be called "obsessed following behavior."
People who complain obsessively and for years, about a perceived wrong or wrong-doer, when no one else can perceive the injury—and people who cannot or will not "let go" of a person or a place or an idea—comprise a wider group of persons that may be problematic in ways that seem similar to stalking. Some of these people get extruded from their organizations—they may get hospitalized or fired or let go if their behavior is defined in terms of illegal stalking. But many others do good or even excellent work in their organizations and appear to have just one focus of tenacious obsession.[16]