
$\mathbf{1}\mathbf{\to}\mathbf{2}$

$\mathbf{2}\mathbf{\to}\mathbf{3}$

$\mathbf{3}\mathbf{\to}\mathbf{4}$

$\mathbf{4}\mathbf{\to}\mathbf{5}$

$\mathbf{5}\mathbf{\to}\mathbf{6}$


New nodes

2,241

2,121

1,911

3,214

3,567

Removed nodes

239

222

230

220

684

New edges

19,472

18,324

17,618

24,805

26,883

Removed edges

642

763

713

782

700

New edges existing nodes

10,044

9,296

9,758

11,925

12,520

u→v

54%

53%

54%

55%

51%

Reciprocated

10%

13%

13%

13%

14%

u↔v

36%

34%

33%

32%

35%

Simple closure

21%

21%

22%

21%

19%

Double closure

9%

10%

9%

9%

9%

 The last two sections report the fractions of different edge types among the new edges created between nodes already existing at the beginning of the time window considered.