In order to quantify as precisely as possible the evolution of social media in Romania, Zelist has made 2 Indexes that monitor the activity of two components of maximum importance of social media: the blogosphere and the Twittosphere. These Indexes are computed monthly, for the previous month.

The .roBlogs Index Formula
Our algorithm generates a monthly score in the following way:
Score_Month=nb_active_accounts*10+nb_posts*3+nb_comments
In order to facilitate following this score (which otherwise would be a number of hundreds of thousands), we used as a reference period the first week of May 2009, which received the value 100.
Thus, the monthly index is the ratio of the Score for the current month and the Score_of the first week of May 2009 multiplied by 100.

.roBlogs_Index=(Score_current_month/Score_week_May_2009)*100

Practically, this score expresses how much the blogosphere has grown compared to the reference period. For example, an index equal to 130 indicates that, compared to may 2009, the blogosphere has grown with 30%.

.roTwitter Index Formula
Our algorithm generates a weekly score in the following way:
Score_month=nb_active_accounts*10+nb_tweets
In order to facilitate following this score (which otherwise would be a number of hundreds of thousands), we used as a reference period the first week of May 2009, which received the value 100.
Thus, the monthly index is the ratio of the Score for the current month and the Score_of the first week of May 2009 multiplied by 100.

.roTwitter_Index=(Score_current_week/Score_week_May_2009)*100

Practically, this score expresses how much the activity on Twitter has grown compared to the reference period. For example, an index equal to 1.300 indicates that, compared to May 2009, the Twittosphere is 13 times more active/enlarged.

.roFacebook Index Formula
Score_facebook= no_active*10 + content_total_posts*3 +  content_total_comments*0.5 + content_total_likes*0.05

.roPresa_Online Index Formula
Score_online_press = no_active*10 + total_posts*3