What You Need to Know Nov 19: Prezi gets funded, Forrester slams social media, Twitter gets searchable.

Cloud presentation company Prezi announced a $57M round of funding, as well as 50 million users and 160 million presentations created. 

Twitter now lets you search for every tweet ever sent.

Email marketing platform Movable Ink says in a new report that 66% of all emails are now opened on mobile devices. Lesson learned: If it ain’t responsive, it ain’t getting read.

And Forrester continues to slam Facebook and Twitter, says marketers should just build their own websites instead of spending money on social media.

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