News roundup: Friday's top business stories
* Aer Lingus cuts profit guidance. * Airbnb to set up Europe base in Dublin. * Twitter announces IPO filing in a tweet, * Top Tips for the Weekend.
The top business news stories on Friday:
**Aer Lingus** has cut its 2013 operating profit guidance to around €60 million from a previous forecast that said the figure would be broadly in line with last year's €69.1 million.
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