Also, GTalk does not use libjingle but its own slightly-different pre-standard implementation, that's why it is impossible to talk to GTalk users with a XMPP client that supports Jingle via libjingle.

This is quite a mess.

I have updated the article to reflect that this was not a very recent addition.

Wikipedia may say 2005 but it did not make the draft status that the article refers to until June 2009, which we can all agree is a lot more recent.