[AHconsidered]

It's funny because Facebook is actually where Cassandra was born. Now under the Apache umbrella, it's odd that they didn't even mention it in that article. It's got by far the most momentum in the distributed database league.

[leef]

Except that they have dumped Cassandra and continue to use and grow MySQL and HBase.

[cyunker]

"Facebook, for example, created Cassandra for certain tasks and also uses the Hadoop-based HBase heavily, but it’s still a MySQL shop for much of its core needs."