Both sound fine in order to make people aware. But for the next one mayne we can make it more engaging if we opened it up by asking what we could do to celebeate her bday.
Example: RT @lxbfree: Apr 1 is Fool's Day, also #LiuXia birthday, #freelxb #Liuxiaobo How are you going to celebrate the day?
Or something like...
RT @lxbfree: Apr 1 is Fool's Day, also #LiuXia birthday, how can we celebrate the day witb Liu Xia & remind the PRC of their foolishess #freelxb #Liuxiaobo
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