In honor of its 10th birthday, YouTube is taking a look at some of the most memorable moments on the platform, from A to Z, starting, not surprisingly, with animals. On April 23, 2005, history was made.

I've been a financial journalist for more than 20 years: I've written for most of the national newspapers in the UK on topics related to business, economics, finance, property, investment, personal finance and entrepreneurship. I've held staff jobs at newspapers including The Observer, the Daily and Sunday Express and, most recently, The Independent, where I spent several years as Business Editor managing the newspaper's business coverage.

With search still playing a dominant role in content discovery and e-commerce, Google's announcement earlier this year that it was revising search algorithms to favor mobile-friendly sites caused some understandable concern on the part of publishers and online retailers. The following figures are taken from a report by Searchmetrics, which tracked the changes in its measure of Mobile SEO Visibility, providing a window on desktop versus mobile search rankings based on comparable search volumes.