why is fanpop not letting me invite friends?

If the browser finished loading and it's a blank page, it's not that your computer or internet connection is slow. There's either a problem with your browser understanding what Fanpop is sending to it (a compatibility issue) or Fanpop is not sending information to your browser. In either case, it's a bug and if it's still not working, it should be reported using the "contact us" link at the bottom of the page.