It allows users to send emotive feelings that may be difficult to express verbally.

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It also makes it increasingly difficult to express the complex unintended consequences of economic systems.

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It's very difficult to express your feelings.

BBC: Paul Beshenivsky

Looking forward to this moment, I knew it would be very difficult for me to adequately express my feelings for these young men and women -- at least in a way that would allow me to get through this speech.

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"It is difficult to find the words to express my disappointment, " he said.

BBC: Laporte proud despite France loss

"The trading environment remains difficult and our biggest challenge continues to be disappointing trading at our core Pizza Express restaurants particularly within London, " the group said.

BBC: Mixed fortunes for UK retailers