S., is one of the only top-ranked sites that allows members to not only register, but also to search and message for free, deriving more of its revenue from advertisers.
Due to the low barrier for entry this leads them to attract more casual daters.
A lonely penguin at an aquarium in England is hoping to find a mate by creating a profile on the dating website Plenty of Fish.
Spruce the penguin's dating profile states the 1-year-old Humboldt penguin is a "Single Penguin looking for Chicks," as he was unable to find a mate among the 13 other penguins at his home in the Weymouth Sea Life Adventure Park.
However, as an online dating coach, I question whether the site was ever one that attracted relationship-seekers to begin with.