Table 5: Layers in SN and their profile for three different flattening processes.

LayerNewNumber of pairs of users (relationships) with common activities on the layer of SN
MovedTopic groupsMovedTopicsTopics/
topic groups
MovedPostsPosts/
topics

Forum creation activity—group addition+6712,2523.3612,9225.74
Forum creation activity—topic addition+2,3132,3131.0013,1575.69
Forum creation activity—member subscribing+5,760111,54419.37792,7327.11
Forum creation activity—post authoring+13,23313,2331.0013,2331.00
Forum creation activity—commenting+49491.00491.00
Group addition—topic addition+1,6141,6141.008,8215.47
Group addition—member subscribing+5,116109,37721.38780,3127.13
Group addition—post authoring+12,20612,2061.0012,2061.00
Group addition—commenting+49491.00491.00
Topic addition—member subscribing+109,376109,3761.00+780,4457.14
Topic addition—post authoring+302,9619,8490.039,8491.00
Topic addition—commenting+1,060440.04441.00
Member subscribing—member subscribing+289,740+12,342,69042.60+83,495,2786.76
Member subscribing—post authoring+779,973779,9731,00779,9731.00
Member subscribing—commenting+2,9032,9031.002,9031.00
Post authoring—post authoring+2,449,226376,9780.1500
Post authoring—commenting+9,340+1,7030.18440.03

3,985,59013,876,1533.4886,702,0176.25
Sum:New: 90%New: 10%New: 3%
Moved: 10%Moved: 90%Moved: 97%