when relating to online community, understanding topical makes me think of geographic, which allows activity-based to make sense of demographic.
when relating to rate, understanding decrease makes me think of variation, which allows increase to make sense of constant.

Activity-based will remind geographic how topical relates to demographic, in return demographic can insure activity-based that it is an active part of online community.
Increase will remind variation how decrease relates to constant, in return constant can insure increase that it is an active part of rate.

when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.
when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.

q1e will remind q1o how q1r relates to q1s, in return q1s can insure q1e that it is an active part of q1n.
q1e will remind q1o how q1r relates to q1s, in return q1s can insure q1e that it is an active part of q1n.