What’s the main idea of the passage?

Like people who share news via Twitter, Facebook and Linkedln, cells, too, make use of multiple modes of information exchange. Some send out hormones, which travel far and wide via the bloodstream; others emit neurotransmitters, which carry signals between one neuron and another. But virtually all cells network with their neighbors via extensive collections of channels that directly connect the inside of one cell with the inside of the next.

Kunal Sarda remembers the first time a foreign language proved a crucial barrier. "I was traveling in France a few years ago, and I found myself caught in the back of a taxi at 2 in the morning without my wallet, trying to explain to the taxi driver what had happened but unable to do so," recalls the 32-year-old entrepreneur. "My partner had a similar story; he was caught in China, really sick, and he could not explain to the pharmacist what medications he needed. "