If Facebook, Twitter, Google+, Quora, LinkedIn and HackerNews weren't sufficient for sharing links and professional thoughts, there's now a new kid on the block. What it says on the tin: "Quibb lets you share what you're reading for work. Use Quibb to post newsworthy articles, see what colleagues are reading, and discuss the day's industry news". But isn't it a social network for professionals like LinkedIn? Not exactly.