My amateur theory based on nothing but opinion. People don't connect on a personal level anymore. Texting on cell phones and posting on social media are "fake" socializing. Families are smaller, so people have less close relatives. While being more "connected" via electronics, we are at the same time more alone on an intimate level, so when despair sets in the support structures are not there. Some times you just need a hug.
Cell Phone Subscribers in the U.S., 1985-2010
Year Subscribers
1985 340,213
1986 681,825
1987 1,230,855
1988 2,069,441
1989 3,508,944
1990 5,283,055
1991 7,557,148
1992 11,032,753
1993 16,009,461
1994 24,134,421
1995 33,758,661
1996 44,042,992
1997 55,312,293
1998 69,209,321
1999 86,047,003
2000 109,478,031
2001 128,374,512
2002 140,766,842
2003 158,721,981
2004 182,140,362
2005 207,896,198
2006 233,000,000
2008 262,700,000
2009 276,610,580
2010 300,520,098