A few weeks ago Dups explained that ALL your attached social media networks contribute to calculating the dividend that you pay to your shareholders. I had suspected that for the past few months. Only the top five networks contribute to the social media activity adjustment of your share price during user close. This information as been updated in the EA FAQ document onsite.
A few minutes ago Dups said that your social media activity over the past 30 days is examined to determine your network score and your dividend. This seems to be weighted by about thirds with the first week having big impact, the second somewhat less, and the third week having limited impact.
Seems like every time I KNOW something it turns out I was wrong.