When I am out and about the last thing I want to do is post crap on my phone. Maybe I'm just old, but it seems rude to divert my attention from the people I am hanging out with in order to check/post on buzz.
I think similarly there will be moments to check Buzz for the group.
If you're on a date with a hot chick/dude, just do it when s/he/you go/es to freshen up.