All of these tactics have helped make Spark Networks a $45 million-plus business. But rival companies are catching on. A growing number of new web sites are aimed at specific groups of singles -- every lonelyheart subset from pet owners to dwarves.
"Nightline" eventually met the three interconnected JDaters that Spark Networks CEO Adam Berger had told us about.
First up were Lori and Jeff Levenson.
"I thought he was Italian... I didn't think he was Jewish," Lori said of Jeff. "I even made him show me his bar mitzvah picture."
After Lori and Jeff married, Lori encouraged her brother, Evan Kutner, to get on JDate.
He married a woman named Carly, who then told her brother, Danny Edelstein, to get on JDate.
Which is how Danny his met future wife, Jordana.
Today, the three couples laugh about their time in the dating pool.
"I had a guy propose to me on the second date, on the Staten Island Ferry!" said Carly. "It was a nightmare!"