Google Talk and AOL Instant Messenger (AIM) interoperability problems. Not yet time to ditch AIM in favour of Google Talk.
If a PicasaWeb user is a Google Plus user, you will be redirected to Google Plus Photos. Here’s how you can browser and follow a user via Picasa web.
If you use you have your own XMPP network enabled on your Google Apps Domain, you will not be able to turn-on Google Plus support.
Google Apps XMPP network currently have a bug, and it is hard to get their attention and fix this issue unless you are “somebody”. No doubt it’s their bug.