If you read Chinese, there are some hilarious comments on this popular bulletin board system. The "689" appears to be a coded reference to the number of people (in millions, 6.89) who voted for Ma Ying-jeou as well as the 689 votes by which Leung Chun-ying won the Hong Kong chief executive election.
Expect updates as new information comes in.
UPDATE: Excellent Taipei Times report showing how the students understand "concern".
On the other hand, in the context of student movements, the term “concern” is often associated with threats and attempts by schools to bar students from taking part in demonstrations.Great work, TT.
“For example, some universities would impose stricter curfews in student dorms because they are ‘concerned’ about students’ safety at night. CGU cuts the Internet connection at dorms at midnight because the school administration is ‘concerned’ that students may stay up all night playing online games,” Chang said. “Moreover, school officials or on-campus military education officers talk to students when student newspapers publish articles critical of school or government policies, saying they only want to show their ‘concern.’”
The term “showing concern” has always had a negative connotation among students, he said.
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