Alright, so I'm going to be working on a social networking site over the next three years, hopefully to have a release date in 2016. I am going to be using HTML5, PHP, and Database setups for it. Before you say "oh ma gawd MySQL bro", I am going to say this, you're a moron.

Now this discussion is about Cassandra and HBase. I am debating on which one to use as my DBMS. HBase is an open source varient of Google's Big Table system, supporting map-like table setups with rows, columns, and timestamps. Cassandra is basically the same with more versatility over node stability and cross platform linking, and is also Open Source.

Anyone have any input?