Keeping up with John Kerry-speak Kerry will be joined in many meetings by a former Senate colleague, Vice President Biden, who's never been accused of shying away from peroration every now and again. Indeed, Biden is the holder of the world indoor bloviation record for his spectacular 1,100-word question during Ruth Bader Ginsburg's Supreme Court confirmation hearing in 1993. So they might want to schedule an intermission. Dean Rusk rarely tweeted But it seems Kerry can limit himself to 140 characters when he wants. Expect him to be far more active on Twitter than his predecessor. On Kerry's first day on the job, the State Department (@StateDept) tweeted that any messages directly from the big boss would be labeled with his initials - JK. By contrast, Hillary Clinton barely dipped a toe into the social-media pool (in fact, the Loop sponsored a contest last year to help her craft her first tweet). As a senator, Kerry clearly enjoyed it, with recent tweets from @JohnKerry covering everything from the death of the owner of a Boston cannoli shop, to the Pats" Super Bowl chances, to a birthday shout-out to then-colleague Sen. Max Baucus (to whom he said, "We're still kids in this place.") But now that Kerry's in the high-stakes world of international diplomacy, he might be in danger of sending mixed messages in a medium where meaning is easily lost. Power parenting We're hearing that Samantha Power , a longtime (since 2005) Obama foreign policy adviser and still likely ambassador to the United Nations - should there be an opening - is leaving the administration in the next few weeks to rest up and "spend more time with her family." She's got two little kids at home; one is 3, the other 8 months.) Power, now senior director for multilateral affairs and human rights at the National Security Council and a former war correspondent, is a professor, a human rights expert and the author of a widely acclaimed book - "A Problem From Hell," which accused the United States of ignoring Balkan genocide. She had been the No. 1 pick for the U.N. slot if Susan Rice had become secretary of state. But with deputy national security adviser Denis McDonough moving down the hall to be White House chief of staff, it's hard to figure anyone but Rice becoming national security adviser if, as expected, that slot opens up with incumbent Tom Donilon leaving perhaps later on this year.