Why Are There So Many Impostors Online? >:( ?

Its really being a disturbing issue lately for me, because over 50% of the people i meet online these days either think i aint real, or u'll find a lady posing as a man,or vice-versa, what could be responsible for such conduct, and what ways cud we advert it, i need your candid opinion, because we are the days of Yahooooze,