Talkative people

I noticed there are some people that, when present, can hold the communication so that there is never the embarrassing feeling that no one has anything to say. I don't think conversation without the presence of such people is meaningless, but sometimes it just happens that there is silence, all the people think what to say next (or say something intelligent like "we should try to find another topic" - yes, Meldath, I'm talking about you). But in the presence of the people, these situations won't happen.
First I thought maybe it's just these are the most outgoing people. But no. Most outgoing people I know don't fall in this category.
I wonder if this is something to be learned or if you must inherit it - or something between.
I could name Bzochi, Monika K. from 6.A and perhaps Fela. And Fela leads me to the assumption the people don't have to say something interesting; yet the feat of being able to speak almost anytime is itself formidable.