The filter list is a very important feature if setting up a feed based on hash tags rather than users but it has two issues
1. The filter matches part words rather than whole words so for example anyone from Scunthorpe may ave trouble if a filter is set up the C word (look it up if you don't believe me).
2. The list is case sensitive so it would be very very easy for people to get around the filter list or for things to be missed.
The capitalisation is the biggest issue for me.