tag:blogger.com,1999:blog-33810541359136784.post4602339390784807984..comments2023-10-11T00:26:57.333-07:00Comments on Collective Behavior: Facebook vs Princeton vs SumpterDavid Sumpterhttp://www.blogger.com/profile/09916867606281043665noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-33810541359136784.post-46308411529719930982014-02-08T13:31:42.225-08:002014-02-08T13:31:42.225-08:00Ha Ha. I tried with Penguins, but it didn't wo...Ha Ha. I tried with Penguins, but it didn't work.David Sumpterhttps://www.blogger.com/profile/09916867606281043665noreply@blogger.comtag:blogger.com,1999:blog-33810541359136784.post-9574936538218951332014-02-08T06:35:35.204-08:002014-02-08T06:35:35.204-08:00I think an interesting question to ask is whether ...I think an interesting question to ask is whether Facebook, Google and the likes have now reached a critical mass that prevents their quick fall. MySpace was very popular with teens but never had more than 100M users (I think they peaked at 95M) and certainly never appealed to corporate businesses for their promotion like Facebook does today for instance. Most of MySpace user base was very volatile compared to the user base of Facebook, Google or Twitter today.Simon Garnierhttps://www.blogger.com/profile/03377504101148782684noreply@blogger.comtag:blogger.com,1999:blog-33810541359136784.post-59961537408509393482014-02-08T06:22:29.831-08:002014-02-08T06:22:29.831-08:00Don't worry, Twitter followers come by waves. ...Don't worry, Twitter followers come by waves. Post a couple pictures of cute kittens and you'll have more followers than me soon :-)Simon Garnierhttps://www.blogger.com/profile/03377504101148782684noreply@blogger.comtag:blogger.com,1999:blog-33810541359136784.post-18977352065199421082014-02-08T02:41:40.962-08:002014-02-08T02:41:40.962-08:00Matlab Code:
%Followers for the days before I fol...Matlab Code:<br /><br />%Followers for the days before I followed anyone else.<br />beforefollow=[1 1 12 1 2 0 1 3 4 1 0 0 1]<br />days=[1:13];<br /><br />%Follwers from after I followed about 70 people<br />afterfollow=[6 4 2 6 5 3 6 8 6 6 5 4 6 7 6 2 3 7]<br />days2=[14:19 21 24 34 38 43 51 58 82 95 96 103 111]<br /><br />figure(1)<br />prop=plot(cumsum(beforefollow),'x')<br />set(prop,'LineWidth',4)<br />set(prop,'MarkerSize',16)<br />hold on<br />prop=plot(days2,sum(beforefollow)+cumsum(afterfollow),'rx') <br />set(prop,'LineWidth',4)<br />set(prop,'MarkerSize',16)<br /><br />hold off<br />set(gca,'TickDir','out')<br />set(gca,'FontSize',16)<br />ylabel('Number of followers')<br />xlabel('Days since David joined Twitter')<br />axis([0 120 0 120])<br /><br />%Put all observations together.<br />allfollow=[beforefollow afterfollow]<br />diffdays=[1 diff([days days2])]<br />cumfollow=cumsum(allfollow)<br /><br />figure(2)<br /><br />dx=allfollow./diffdays;<br />x=cumfollow;<br />prop = plot(cumfollow,allfollow./diffdays,'kx')<br />set(prop,'LineWidth',4)<br />set(prop,'MarkerSize',16)<br />set(gca,'TickDir','out')<br />set(gca,'FontSize',16)<br />ylabel('Increase in followers')<br />xlabel('Number of Followers')<br />hold on<br /><br />%Fit the logistic equation<br />P = polyfit(x,dx,2)<br />prop=plot([1:121],P(3)+P(2)*[1:121]+P(1)*[1:121].^2,'k')<br />set(prop,'LineWidth',4)<br />axis([0 120 0 8])<br /><br /><br />simx(1)=1<br />for t=1:120<br /> simx(t+1)=simx(t)+P(3)+P(2)*simx(t)+P(1)*simx(t)^2;<br />end<br /><br />figure(1)<br />hold on<br />prop=plot([1:121],simx,'k')<br />set(prop,'LineWidth',4)<br /><br />David Sumpterhttps://www.blogger.com/profile/09916867606281043665noreply@blogger.com