Tweetie and all other apps all decide to censor content, but it is based on Apples approval process in which they decline apps based on "offensive content". So yes the developer blocks those sections, but ONLY in order to get it past the nanny state, finger trigger happy Apple censors.
And where were you to defend apple when all those people were bitching earlier this year that their kiddy got onto porn with the iphone?
Oh wait, i forgot, you joined just to make this thread....
What I really don't get is why you care so much, if it honestly bothers you enough to get in such a tizzy then why dont you take your business to another platform. OH YEA! they have filters as well in their app stores!