Table 4.

Associations between Online SNS Activity and Risk Behaviors (n=1,315)

	Smoking at T2		Alcohol Use at T2
	Main effects model (β)	Interaction model (β)	Main effects model (β)	Interaction model (β)
Number of Facebook friends	.04	.04	.04	.03
Number of Myspace friends	.02	.01	−.04	−.01
Number of friends posted pictures partying or drinking	.11^***	.09	.06^*	.15^**
Number of friends talk about partying online	−.02	−.04	.02	−.01
Facebook frequency	<.01	<.01	−.01	<.01
MySpace frequency	−.01	−.01	.06^*	.06
Smoking/drinking at T1	.64^***	.64^***	.53^***	.53^***
At least one smoking/drinking friend	.07^***	.05	.08^***	.09^**
Parent smoking/drinking	.06^**	.06^**	.08^***	.08^***
Age	−.05^*	−.04^*	−.02	−.02
Female	−.04^*	−.04^*	.01	.01
Hispanic	<.01	<.01	.02	.02
Socioeconomic status, rooms/people	.02	.02	.03	.03
Academic achievement	−.09^***	−.09^***	−.06^**	−.06^**
Health status	.01	.01	<.01	<.01
Number of friends nominated	−.08^***	−.08^***	−.03	−.03
School 1	.02	.02	.03	.03
School 2	.02	.02	.01	.02
School 3	.02	.02	.02	.02
School 5	.02	.02	.01	.01

Friend smoke/drink ^* Friends on Facebook		−.01		<.01
Friend smoke/drink ^* Friends on MySpace		.02		−.05
Friend smoke/drink ^* Friends post risky pictures online		.02		−.10^*
Friend smoke/drink ^* Friends talk about partying online		.04		.06

Adjusted R²

p<.05,

^**

p<.01,

^***

p<.001