The photos showed several seals sunning themselves on offshore rocks near Staten Island.
Small business owners say their social media efforts are yielding new customers and more sales.
City Councilman Brad Lander is using Twitter to get ideas for participatory budgeting suggestions.
The popular pop-singer's new song "Welcome to New York" was released on Tuesday.
The city is asking for feedback from small business owners to see how it can better serve them.
Win a pair of $50 tickets to Taste of the Village by posting photos of the top dishes at local eateries.
An NYPD deputy said officials "will make mistakes" along the way, but will continue to use social media.
Deputy Commissioner Zachary Tumin said a strong social media presence is a "must-have tool" for police.
Dozens of agencies changed their social media profiles for Pride Week following de Blasio's request.
Deputy Inspector Fausto Pichardo will tweet about crime and safety in Spanish and English.
The precinct will invite locals for a tour.
The 25th Precinct is one of five in the city to use Twitter under a trial program.
The police commissioner said the department would continue wading into social media.
Councilwoman Debi Rose launched the #NorthShoreSI campaign to get residents to tweet pics.
The NYPD started the hashtag #myNYPD, which was quickly hijacked to post negative pictures of police.
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