Twitter, Square and LivingSocial are reportedly taking steps to bar investors from secondary market trading. [Bloomberg

Dennis Crowley is likened to Graydon Carter and Kurt Andersen in the third paragraph of this Ad Age profile. [Ad Age]

Groupon will drop that wonky accounting that ruffled feathers in its IPO filing. [ATD]

New funding may value Dropbox at $10 billion. [TC]

“Shopper Receipts Join Paperless Age.” [NYT]

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