Social scientists and law enforcement agents have devised a profiling system to describe various types of stalkers. Most of these were cited in Todd Bancroft's study and the Law Reform Commission's 2000 report. Delusional erotomaniacs: They believe the person they are stalking is in love with them but through various imaginary circumstances they cannot be together. Their victims usually enjoy a higher socio-economic status, such as celebrities and public figures, and may not even be aware of their stalkers' existence previously. Love-obsessives: They are often found among professionals and affluent people who know their 'love' interest does not reciprocate their feelings. Their victim is usually someone they interact with regularly, such as a friend or colleague from work. Many are workaholics with no personal life. Former intimates: By far the most common type of stalkers, they are also the most dangerous. They are former lovers, spouses or business partners who want to mend a broken relationship or simply seek revenge. Abuse and intimidation may have started before the relationship ended - domestic violence is the most common example. Sociopathic stalkers: Silence of the Lambs types who are found among serial rapists and murderers, but are uncommon. They select victims at random and rape or kill them for personal satisfaction, usually motivated by a need for control and domination. To these profiles, the Law Reform Commission and Mr Bankcroft add several more with SAR characteristics. These occur in other places but are particularly common in Hong Kong. Cyber-stalkers: They send unwanted or abusive e-mail messages repeatedly to their victim. They may also disclose their victim's personal information on the Internet, or impersonate him or her in online chat rooms. Mr Bancroft says cyber-stalkers are 'omnipresent in Hong Kong'. Triad stalkers: Criminal gang members stalk a targeted shop owner for 'protection money' or to collect debts. Neighbourhood stalkers: They are typically youth gangs and are common in highly populated public housing estates where they harass residents and create a threatening atmosphere in the neighbourhood. This form of harassment is different from previous characterisations because it rarely targets a specific person.