i want to admins of sites on my network be more connected,

Hello i want to admins of sites on my network be more connected, i want to add some plugins on subsite that people on one site can see some latest or toprated posts on other subsite, or to allow admin to exchange banner 1:1 but with system where they make their own banner and then place html code in their site (and that code rotate some banners)and how many visits they send that number of visits they recieve. or to add post rating widget on all sites (tell me whats the best) and to set up widget on all blogs (that widget cant be removed)to show top rated post on all blogs in last 3 days.. maybe i wrote this little confused but you will understand what i thing.. in short: to visitors can move form one to other blog on my network with no need to visit main site and look at livestream widget or global site tags.