Ever wondered whether your favourite website is actually down, or whether it's just an isolated problem at your end?
Well, there's one way you can do a quick survey of millions of users - Twitter. Twitter allows you to run searches on any term to find out whether other users are tweeting about your particular area of interest.
For instance, I couldn't get into my Gmail account this morning - so ran the search ‘Gmail down' on Twitter. See below for the results.
Given that PCA has only just started using this micro-blogging phenomenon (follow us here), it's likely I'm late to the game with this - and it's clearly not the killer feature that will finally convince Twitter sceptics to register an account.
But a quick search allows anyone (account holder or not) to get near-instance feedback on the views of millions - scooping news aggregators in many instances.