This is bad news. Topsy was an excellent Twitter search engine - with over 426 billion tweets in its database. It was fast, effective and very good at its job. So good in fact that Apple bought them a couple of years ago. Now they have decided to close it. On Tuesday night they sent out a very sad tweet from the @Topsy account: "We've searched our last tweet". The site now redirects to an Apple support site, urging us to use Siri to search. This is a real case of 'WTF?' It did a superb job and had little by the way of competition. Even Google realised the importance of searching Twitter properly and renegotiated a deal recently. So we're left with Google and the Advanced Twitter search function, neither of which are as good as Topsy was. Apple is simply being a dick here. It's not big, funny or clever.