Should You Make Fitbit Your New Dating App?

> It’s pretty clear that the data does not support the conclusion that better dates are correlated to higher heart rates.

...so the post admits that correlation does not imply causation?

There are many, many reasons why a heart beat will spike. The number of spike is irrelevant. An average heartbeat for each date vs. average heartbeat for normal behavior would be a better comparison, but still flawed (e.g. coffee dates!).