# Twitter 2008-11-17

- Link: https://www.martinfrindt.net/2008/11/twitter-2008-11-17/
- Published: 2008-11-17T23:59:59+01:00
- Author: Martin Twitter

* How to calculate cost-per-acquisition for startups relying on freemium, subscription,
   or virtual items bi.. [http://tinyurl.com/6y7xq3](http://tinyurl.com/6y7xq3) 
   [#](http://twitter.com/frinsen/statuses/1009993042)
 * Metamorphosen der Werbung:
    Dave Winer lehnt sich weit aus dem Fenster: Mitten
   in die Wirtschaftskrise hi.. [http://tinyurl.com/5mm37g](http://tinyurl.com/5mm37g)
   [#](http://twitter.com/frinsen/statuses/1009455865)
 * The Art Of The SEO Proposal:
    Following on from last weeks post, How To Be An
   SEO Service Provider, we’ll.. [http://tinyurl.com/6arxjd](http://tinyurl.com/6arxjd)
   [#](http://twitter.com/frinsen/statuses/1009235525)