There’s an article in the New Yorker, Inside the Fight Over Bitcoin’s Future, 25 August 2015 (by Maria Bustillos) about the split over the increasingly heated debate in the bitcoin community over the maximum size of a block.
The current maximum size accepted by the Bitcoin Core node software is 1MB (which means the network can support only approximately 7 transactions per second). There are lots of proposed solutions to this, including increasing the block size, but they are controversial and also raise lots of issues about how to make decisions like this for a decentralized system.