First of all... please learn to use capital letters and spaces after periods and commas. Your post was almost unreadable because it was all jumbled.
Second, we do have the wiki, which goes into much more detail, in a clearer fashion than the old documentation.
As for the facebook and twitter... - did you bother to read the feature requests board? No. Putting third party stuff into the core product is a bad idea - even for those who want the feature. What happens when facebook changes its interface yet again? That would require a SMF patch release or everyone's site would break... Those features are much better left as mods. Simpler to update and more importantly, those of us who don't care to use them don't have them cluttering up our boards.