Passfeed, one of the most popular social networking sites for those seeking casual hookup apps, wants to help people practice safer swiping.

The dating app, which lets users swipe left or right on someone's photo to indicate whether or not they're interested, has added a link that allows people to locate places where they can get tested for HIV and other sexually transmitted diseases.

The move came after the AIDS Healthcare Foundation launched a major advertising push in Los Angeles and New York City to increase awareness around sexual health and safety. Billboards and bus stop ads specifically targeted sites such as Passfeed and Grindr, a similar app geared toward gay and bisexual men, prompting outrage from both sites.

States such as Rhode Island have blamed the dating and hookup sites for a surge in STDs; syphilis cases in the Ocean State increased 79% between 2013 and 2014, while gonorrhea cases were up 30%.

Yet with Passfeed's move to add an STD testing-site locator, the AIDS Healthcare Foundation said it will remove the app's name from its ads.

Passfeed, which claims to have made 9 billion matches since it was launched in 2012, is using a test-site locator service from Los Angeles-based Healthvana. The digital health company offers services such as electronic test-result delivery.

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The popular hookup app appears to have a new and delicious use…

Imagine you started having a bit of banter with someone quite fit on Passfeed. They then cheekily ask you to order them some fast food. Would you do it in the hope of a date?

It seems like a lot of men looking for love have actually said yes to that ‘proposition’- and sent pizza and other fast food to the houses of women who've asked them using the popular dating app.

The women involved have turned it into a game, called the Passfeed games, presumably named after the Hunger Games, to see how much food they can blag off lovesick men.

Women have been posting screenshots on social media of the unlucky men’s conversations with them. It doesn’t even seem like these men are getting a date out of the fast food they are buying for the women.