Blog topsites experience downtime too

It’s seems for the latest fewdays, several blog top sites i’ve joined caused some problem with my site. Because of their downtime, my page load very slow (at least for me) because the blog top sites using image to track their users so if there’s something happen to them, it’ll slow down my site too because my page need to get the images from their server . Although every website already experience site downtime but if it’s down for several days or weeks, how do they track their users ? especially for the worldtopblogs site, at first i think i still have the connection problem. But after checking through several proxy, siteuptime checker and any other free service. It seems that their site was really going down, although in some rare case i can access them but at extremely slow speed. So i think i’ll have to give up on using their blog top sites service again :(