Marc Andreessen explains why they gave rapgenius.com $15 million. The idea dates back to 1993, the year of Enter The Wu-Tang. Annotation, sounds like good times.

Finally, there’s the other reason – maybe even the real reason – why I’m so fired up about this idea and this investment.

Only a handful of people know that the big missing feature from the web browser – the feature that was supposed to be in from the start but didn’t make it – is the ability to annotate any page on the Internet with commentary and additional information.

Back in 1993, when Eric Bina and I were first building Mosaic, it seemed obvious to us that users would want to annotate all text on the web – our idea was that each web page would be a launchpad for insight and debate about its own contents. So we built a feature called “group annotations” right into the browser – and it worked great – all users could comment on any page and discussions quickly ensued. Unfortunately, our implementation at that time required a server to host all the annotations, and we didn’t have the time to properly build that server, which would obviously have had to scale to enormous size. And so we dropped the entire feature.