De Clerambault syndrome is a psychological condition named after Gaetan Gatian De Clerambault in which the sufferer is under the delusion that a certain person is in love with him or her. This is a condition in which the patient, often a single woman, believes than an exalted person is in love with her although the alleged lover may never have spoken to them. Occasionally, isolated delusions of this kind are found in abnormal personality states. Erotomania may also be a feature of paranoid schizophrenia. Sometimes, schizophrenia may begin with a circumscribed delusion of a fantasy lover, and subsequently delusions may become more diffuse, and hallucinations may develop. This chapter will focus on the role of technological advancements in the origin of this syndrome in various age groups.