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The company told the Los Angeles Times' Paresh Dave in November that it had 30 million users; the number has likely grown significantly since then.
In January, Tech Crunch's Jordan Crook reported that Tinder makes 21 million matches and processes 1.5 billion swipes every day. For context, the company hit the 1 billion matches mark in March 2014, 500 million matches in December 2013, and 1 million in January 2013.
There does appear to be a major gender imbalance among people using location-based dating apps, however.
A report from the market research firm Global Web Index found that 62 percent of users of apps like Tinder are male.
Tinder's social media staff had a spectacular meltdown on Twitter on August 11, attacking Vanity Fair reporter Nancy Jo Sales for a not-great piece on the dating app for painting users in a bad light.
52 percent of Tinder users are between 18 and 24, and 33 percent are between 25 and 34.
A third hack allowed users to engineer matches with users who rejected them, and then see those users's emails.
Tinder claims all problems have been dealt with, but three security problems in one year is kind of a lot. If you log onto Grindr, you get an array of user pics for guys geographically near to you.
Women tend to get messaged much more frequently than men on online dating services, and if their inboxes are so full as to be actually unmanageable, the service becomes worthless.
Being able to control who sends you messages means Tinder evades that problem. The most famous of these is probably Humanitarians of Tinder, which collects images of Tinder users whose photos portray them interacting with poor residents of developing countries, presumably in an attempt to show off their own empathy for the less fortunate. But my personal favorite is Adam Langlois's Hello Let's Date, where he manages to turn Tinder into a platform for dark, vaguely surrealist jokes, mostly at his own expense.
One vulnerability, present for about two months in 2013, allowed hackers to triangulate a Tinder user's location to within 100 feet.