Mylot changed a lot?

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I've been out of mylot for a very long time.now,when i came back,i found there are a lot of differences. first,mylot has expressions,but i dont know how it works,i just found my friends can post different expressions,that is fun,but how to do it?i need your help,friends. and other differences,i cant tell at once.i feel it's different,progress,maybe. Are there any other significant changes that is interesting?