This week in the blog-o-verse:

• Pew has released a new report on Twitter use. Resource Shelf lists highlights including doubled use by adults aged 25-34 since late 2010
• National Academies Press has made all of their PDF format books free! Byte Size Biology and others are excited about thousands of free science books
• “Maria Pallante named register of copyrights” (via DigitalKoans)
• NER’eastah reports NLM has rolled out an iPad app for Turning the Pages, which allows users to read digitized portions of rare medical books and curatorial comments. Three books are currently available for the app.
• The Daily Scan summed up a literature review just published in JAMA finding “Highly cited biomarker studies tend to report larger effect estimates  for associations than subsequent meta-analyses”.
• Creative Commons videos are now on YouTube