Table 1. Sample description of the panel waves (N and percentages).

	Wave 1	Wave 2	Wave 3	Wave 4	Wave 5	Wave 6
Note. SNS = social networking sites.
Sample size	3,367	2,678	2,273	1,953	1,627	1,330
Attrition rate (%)	–	20.46	15.12	14.08	16.69	18.25
Female (%)	49.36	48.73	48.22	47.98	47.02	46.69
Users of SNS for private purposes (%)	71.43	72.78	71.84	70.30	70.13	69.77
Age 18–29 (%)	18.03	15.24	13.68	11.27	9.04	8.50
Age 30–39 (%)	15.36	15.53	15.26	14.80	13.52	12.56
Age 40–49 (%)	19.22	19.34	18.79	18.08	17.58	16.69
Age 50–65 (%)	26.37	26.89	27.76	29.03	29.32	29.70
Age 65+ (%)	21.03	22.97	24.51	26.83	30.55	32.56