Online dating is the second most popular way for heterosexual couples to meet

"Loose ties have traditionally played a key role in meeting partners. While most people were unlikely to date one of their best friends, they were highly likely to date people who were linked with their group of friends; a friend of a friend, for example. In the language of network theory, dating partners were embedded in each other’s networks.
Indeed, this has long been reflected in surveys of the way people meet their partners: through mutual friends, in bars, at work, in educational institutions, at church, through their families, and so on.
Online dating has changed that. Today, online dating is the second most common way for heterosexual couples to meet. For homosexual couples, it is far and away the most popular.
That has significant implications. “People who meet online tend to be complete strangers,” say Ortega and Hergovich. And when people meet in this way, it sets up social links that were previously nonexistent.
The question that Ortega and Hergovich investigate is how this changes the racial diversity of society. “Understanding the evolution of interracial marriage is an important problem, for intermarriage is widely considered a measure of social distance in our societies,” they say."

Source:  MIT Technology Review, 10th October 2017

How heterosexual couples in the US met their partners, 1940 - 2009

Source:  BBC News, 13th February 2016

Tinder has had 40m downloads

"Dressed in skinny jeans and a blue blazer, Rad unspooled a series of ever more staggering stats. Tinder, which has logged 600% growth over the past 12 months, has been downloaded 40 million times since it launched in 2012. The 30 million people who have registered collectively check out 1.2 billion prospective partners daily—that’s 14,000 per second. And they’re not just kicking the tires: Tinder is now facilitating almost 14 million romantic matches every 24 hours. As originally planned, Rad then confidently revealed the idea for the premium service, as 1,000 tweets shot across the Internet heralding the news. In the hallway immediately after the talk, he did a live interview with CNBC. “After this last year,” he sighs in retrospect, “being able to detach like that onstage was a walk in the park.”"
Source:  Forbes, 4th November 2014
Related - Tinder has a minimum age limit of 13

Tinder has a minimum age limit of 13

"Eligibility. No part of Tinder is directed to persons under the age of 13. You must be at least 13 years of age to access and use the Service. Any use of the Service is void where prohibited. By accessing and using the Service, you represent and warrant that you have the right, authority and capacity to enter into this Agreement and to abide by all of the terms and conditions of this Agreement. If you create an account, you represent and warrant that you have never been convicted of a felony and that you are not required to register as a sex offender with any government entity. Using the Service may be prohibited or restricted in certain countries. If you use the Service from outside of the United States, you are responsible for complying with the laws and regulations of the territory from which you access or use the Service."
Source:  Tinder terms & conditions, retrieved 4th November 2014
Note - You need to be on Facebook to sign up for Tinder, so this is simply Tinder's way of authenticating identity.

The average Tinder user spends 77 minutes per usage day using the app

"It’s not just all soccer and samba in Brazil at the moment. There also seems to be an increase in a passion of a third, technologically-augmented kind: an explosion in location-based dating apps, fueled by a volatile mix of delirious FIFA World Cup tourists, excited locals, and perhaps copious quantities of alcohol.
Tinder—the dating app that sees 750 million swipes and 10 million matches every day—has seen a 50% increase in downloads and usage in Brazil since the World Cup began. Brazil is Tinder’s third-largest user base behind the US and the UK, and the app is available in Portuguese.
“The average Tinder user spends more than one hour a day on Tinder, approximately 77 minutes, and that number is up by nearly 50% in Brazil since the start of the World Cup,” Tinder spokesperson Rosette Pambakian told Quartz.
Grindr, an app for gay and bisexual men, has also seen numbers spike. Compared to early June, the number of times users have opened the app has increased by 31%; and time spent on each session has jumped by 26%, a spokesperson said. Brazil is the sixth-largest market for Grindr, with 202,972 active monthly users."

Source:  Quartz, 25th June 2014

Note - I'm assuming they mean per usage day - e.g. use it for 10 days per month, spend 770 mins

Tinder generates more than 600 million profile views and 6 million matches a day

"Originally launched in the US in August 2012, the smartphone dating app has since spread its blend of location-based profile matches and text-chatting around the world. That includes becoming the latest participation pub-sport in the UK, where groups of friends enthusiastically approve or reject potential matches on behalf of one another.
For fans, it’s an addictive cross between online dating, Am I Hot or Not and Fruit Ninja – the latter in terms of its speedy-swiping user interface. Users create a profile, then browse users nearby marking those they like. Whenever they’re liked back, the pair can text-chat and decide whether to meet up.
In the last 60 days, Tinder has added more than 1m new users in the UK alone, according to co-founder and chief marketing officer Justin Mateen, who tells The Guardian that the app is currently generating more than 600m profile reads and 6m matches a day."

Source:  The Guardian, 24th April 2014