i have written an idea on 2010-10-24 11:43 utc+4 in wordpress.org/extend/ideas ie a week ago, but it is not published:
captcha api, so that forum plugin can use captcha plugin and registration, commenting use same captcha plugin through it and also plugins like contact, voting also can use same captcha plugin.

i agree if you say it is not understandable ) .

other my ideas there are at wordpress.org/extend/ideas/profile/qdinar .

their headings: “warn commenter about premoderation” and “make standart warning commenter about premoderation before he posted” about same thing, maybe i will try to post it again ) , better way, “update button that work with ajax, so do not rebuild whole page”, “tag categories ie tags hierarchy”, “(sub)sites with same theme should use static css and image files with same uri”.

if you write to somebody with his name and “@” he even do not see it, because reads many tweets. he does not scroll his feed till place where he read last time.
you cannot see retweets of your tweet, can you?
you cannot see replies to a tweet except tweet of yourself, if author of that tweet do not reply to that reply.
(“tweet” is twitter post).
2010-10-07: all these are in new version of twitter.