Are Text Messages Killing, or Saving Us?

That seems to make sense simply for the sex part of the study, the author even admitted to such in the original study, saying the equivalent of text messaging is correlated with increased sex among youth. However, he never implied that it was the cause of it. I think that would've been the equivalent of career suicide.

What I'd like to know more about is the link between texting, social media and the other factors presented that didn't have clear cut explanations. People who are generally more social are bound to be more promiscuous etc. but why was there a link between texting and socioeconomic status, and why was the trend reversed for social networking compared to texting? Also why was there increased rates of obesity for this same group? Aren't larger people usually less social? It's not as simple a study as it seems.

you will note the author clearly states that the correlation does not imply causation and its more than just the sex its about risky behaviour in general

Correlation does not imply causation.

I guess we need to do the 'correlation or causation' flash test at least once a day in the contemporary age...

Hint: what personality characteristic might you imagine could move someone to both have sex more often and make a lot of social contacts?