Pros: There is a strange thrill in being able to 'swipe' that acquaintance you've always fancied, asking them for a date (up) or telling them you want to sleep with them (down). Cons: It pulls in every single woman who happens to be your friend on Facebook, even if they haven't joined Down yet (your cowardly come on will be waiting for them if they ever do), making it rather pointless.
The USP: If you're dog-obsessed here is where you can rest assured you're in good company.
Pick your future partner based on their dog preferences, small, scruffy or otherwise.
The USP: Hook up with the people you walk past on the street.
Pros: Once you get over the slight stalker complex Happn instils on you by showing women who walked past your front door an hour ago, matching with users within a 250 meter radius is actually quite handy.
Also, spend too much time on it and you start getting paranoid you're seeing 'someone you liked on Happn' every time you sit in your local cafe. This means having a handy mutual connection to discuss / slag off when you meet up for drinks.