I have 47 people on my ignore list.

[Cal Carpenter]

54. I use the Block Mail option as sort of a troll watch

Does anyone else do that?

I don't have anyone on full ignore, but I have a couple dozen at any given time in my Block Mail list. I add people when I'm convinced they will get themselves banned someday so I can see if my instinct was right. Some are short-term trolls that last a day, others are long time posters who I think are doing the long con on DU. Most of them are eventually PPRed, although I have some old stragglers on there who haven't' posted in a year or more, or never agreed to the new TOS. I go through the list once every few months and clear out the ones that were PPRed and get a dose of feeling smug about it.

I do hide threads sometimes, but more out of self-protection like someone above said - I don't post a lot and am generally even-keeled, but sometimes I have a hard time keeping my snark or frustration in check when people are being obtuse or dangling bait or whatever. So by hiding a thread I can keep myself from chiming in.