Wow, that's a word I haven't heard in a while. It's really not surprising that Benjamin has used the word glib before. I don't think I've ever used it in real conversation before. But, I have seen it used once or twice.
Glib is used most often to describe a smooth talker who uses lots of fancy words. Politicians seemed to come to mind when I hear the word.
"American politicians will will say anything to appeal to voters, so they become excellent in regards to glibness, wordplay, and beating around the bush."
"The glib car salesman had me signing the dotted line in no time at all!"