A、Indifferent. B、Neutral. C、Negative. D、Positive. D本题四个选项均为表态度的词，预猜本题为观点态度题。新闻末尾提到，分析家对Instagrarn未来的增长非常乐观(optimistic)，故D正确。

[3]Facebook is launching a new mobile app called Notify with subscription content from media partners like The Washington Post and Vogue.
    The Notify app lets users subscribe to content from media partners on their smart phones. Facebook will be able to add news alerts in its daily notifications to a global audience.
    Facebook’s "renewed push into mobile news reflects a big, global shift in media consumption patterns," said the Financial Times.
    Facebook’s profit and revenue growth reflected this shift in media. The world’s largest social media platform said its third-quarter revenue grew to $4.5 billion on the strength of its mobile advertising.
    Facebook, with 500 million users, has doubled its daily page views to 8 billion since April. The company also owns Instagram, a mobile photo and video-sharing app with 400 million users. [4]Anajysts were optimistic about Instagram’s future growth.
3. What do we learn about Notify from the news report?
4. What is Analysts’ attitude towards Instagram’s future?