humor/teasing, 2, 42, 48, 49, 52, 56, 184, 235, 244

Hurlbert, Jeanne, 16

Hurst, Melanie, 28

hypothesis:

alternative, 190

buffer, 6–8, 13, 150, 154

direct effects, 6, 13, 150

hypothesis, 6, 7, 180–185, 207–211, 220

null, 190–192, 195, 199–201, 204

impersonal, 19, 20, 57, 214

indegree; see also degree, 66–68, 112, 117, 120, 121, 135

instrumental support, 11, 32, 33

Internet:

Internet, xxiii–xxv, xxviii, 6, 32, 220, 222–224

discussion group, 15

forum, 16, 22, 25, 216, 220

scholars, 24

inter-rater reliability, 36, 43

intimacy, xxvii, 19, 20, 47, 55, 142, 147, 159, 164–169, 180–187, 190, 191, 197–201, 206–214, 218, 245

isolates, 64, 66, 76, 79, 81, 92, 101, 102, 123, 134, 185

Jackson, Pamela, 7

jokes, 49, 187

Kahn, Robert, 10

Kaplan, Berton, 1, 7, 10

Kawachi, Ichiro, 8

Keeton, Shirley, 174, 223

Kestnbaum, Meyer, 224

Kiesler, Charles, 7

Kiesler, Sara, 19, 22, 56, 220

Kim, Min-Sum, 40

kin, 13, 156

King, Storm, 17, 22

Kleinbaum, David, 7

Klemm, Paula, 28, 29

Kling, Rob, 22

Knipscheer, C. P. M., 10

Knoke, David, 128

Korenman, Joan, 16, 225

Kraut, Robert, 54, 55, 220, 223, 224

Kuklinski, James, 128

Kuo, Wen, 5

laboratory setting, 20

Landman-Peeters, Karlien, 5, 6

Launier, Raymond, 7

lay:

expertise, 167, 168

experts, 168, 169

Lazarus, Richard, 7

Lea, Martin, 19, 26, 55

leadership, 122, 219

length of commitment, 12, 155, 170

level of analysis:

actor, 64, 66, 67, 74, 75, 78, 80, 81, 82, 112, 146

aggregate, 66, 74, 81, 82, 100

network, 64, 66, 74, 81

level of dedication, xxviii, 161, 163, 180–186, 188, 190, 193–197, 207–212

Liebler, Carolyn, 9

limited mobility, 23

Lin, Nan, 5, 10

Litwak, Eugene, 5, 11, 12, 18, 150–152, 154, 157, 243

Liu, William, 165, 169

Loader, Brian, 24, 32

lurkers, 19, 222