[교양] Open Graph protocol

http://ogp.me/

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[ios] collection view paging bug

http://stackoverflow.com/questions/13228600/uicollectionview-align-logic-missing-in-horizontal-paging-scrollview

http://stackoverflow.com/questions/13492037/targetcontentoffsetforproposedcontentoffsetwithscrollingvelocity-without-subcla

override

flowlayout’s method

targetContentOffsetForProposedContentOffset