本期内容：

Facebook has defended itself against claims that using the site can damage wellbeing and mental health.
In a blogpost, it said while there was evidence it could negatively affect mood, the way it affected people was determined by how they used it.
Facebook's downsides could be combated by making more use of the site and interacting positively.
A social media expert said the way Facebook was built made it hard to use it in those better ways.

defend vt. 辩护
wellbeing n. 幸福康乐
downside n. 缺点
combat vt. 克服



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