Recently active topics in Twitter tagged with failure

In the past 24 hours (its now Monday morning July 21) no new tweets from people I am following show up on the main Twitter page (where normally you see all your friends' tweets. If I manually go to an individual friend's twitter page, then I see their updated tweets...but whatever process Twitter uses to aggregates these into a single feed of all my friends is failed. ANyone else having this problem now. It looks like others have had it in the past -- how do you recover from it?

I tried both PC and mobile (iPhone) but I get the same error message. I click the Follow button on my friend's site and get the "Something went wrong! Please refresh the page and try again." dialog box.

I joined Twitter in the past month and this is the first person I tried to add where I got an error.