marginryan, all, Re:"ignore"
While there are times when Bob's filter may be used to really ignore a person based on civility or other personal considerations, I think that's far from the only use.
On SI I regularly read one board that was a mix of LTBH investors and daytraders, but all of the same stock. Some of the LTBH crowd would check in only once in a while and didn't want to read a gazillion messages of importance only to daytrading so they would use the ignore feature to eliminate daytrader posts. Everyone got along, they just didn't want to read everything.
I think many readers may check in only once a day and don't have time to deal with the volume of posts - I think that Bob's filter is one tool they can use to manage this.