"3.4 billion internet users worldwide"
"19% of internet users... currently using online dating websites or apps"
"The worldwide online social discovery market is estimated at US$100 billion. US$4 billion is the size of the online dating market alone"
"Revenue in the 'Dating Services' segment amounts to US$4,886 million in 2017 and US$5,871 million in 2021. The market's largest segment is the segment 'Matchmaking' with a market volume of US$2,370 million in 2017"
"Facebook was used by 79 percent of U.S. internet users"
"84% of dating app users stated that they were using online dating services to look for a romantic relationship. A further 43 percent used online dating for friendly contact and only 24 percent of respondents stated that they used online dating apps and services explicitly for sexual encounters. Dating sites and apps were most popular among younger internet users - 30 percent of U.S. internet users aged 18 to 29 years were currently using dating sites or apps and a further 31 percent had done so previously"
"Majority-owned by InterActiveCorp, Tinder generates one billion matches... and 10 million matches a day"
"24% of Tinder users are paying for online dating services"
"JMP Securities predicts Tinder to be worth US$1.6 billion, with US$121 million coming from subscriptions alone" 
"The number of users on each dating site in the list is 5,000 to 100 million"
"The number of users on each social network in the list is 10,000 to 4.2 billion"
They all started from scratch
