There are 3 accounts, such as A, B, and C
client gets 5 tweets for each account and make a list as follow.

A1
A2
B1
A3
C1
A4
A5
(more for A)
C2
B2
B3
C3
B4
B5
(more for B)
C4
C5
(more for C)

then click (more for A) button, so client gets #5 ~ #10 tweets for account A, and TL will be

A1
A2
B1
A3
C1
A4
A5
A6
C2
B2
A7
B3
C3
B4
A8
A9
A10
(more for A)
B5
(more for B)
C4
C5
(more for C)