While Twitter appears to have gone from mainstream to overblown in a little over 30 days, Linkedin marches on with more and more add-ons & apps. Maybe its the lack of guilt, Which Facebook always carried with it.
New Google add-on Latitude is really cool and looks like it links with all the right platforms, love the privacy statements that you can set fictitious locations (Google suggests 'Victoria Falls' -WTF??) so your love ones needn't know all your movements 24/7. Neat! fantastic location based software that you use to tell people where you are not, genius.