The first man Sally met through Tinder seemed promising.
"We had a really good repartee," Sally says. They went on two dates and chatted constantly, exchanging about 80 messages.
And then, with no explanation, he sent her a text message cutting her off.
"Because this guy had no connection to me, he had the ability to be brutal," says Sally, 30, a make-up artist from London. She joined Tinder two years ago after a relationship finished and recently signed up to happn, another app which matches users to people they have physically crossed paths with.