I work at Lucidchart (http://www.lucidchart.com http://www.lucidchart.com), a browser-based diagramming tool, and I can definitely confirm that UML is still use

I work at Lucidchart (http://www.lucidchart.com http://www.lucidchart.com), a browser-based diagramming tool, and I can definitely confirm that UML is still used very widely. Though I can't share specifics, I can confirm it's among our most popular diagram types.