SEOmoz, a leader in SEO software, has offered link intelligence APIs for a few years (Mozscape being the latest). Although Mozscape has garnered high adoption rates (over 10 million requests/day), customer feedback uncovered shortcomings. SEOmoz now knows that 10 requests/second and a max of 50 URLs/batch "is not able to support everyone's use case." Accordingly, SEOmoz enhanced Mozscape API capabilities and is currently in beta. Although the beta is in its early stages, throughput has increased 400%.
Developers looking for trends in Twitter search are finding it more difficult now that the micro-blogging site has decreased the search history to four days. Previously going back weeks and months, the backlog has steadily decreased, now too short for some types of applications. At the same time, the newer streams have become the go-to API for former search use cases.