Reports are out that micro-blog site Twitter has rejected a $500Million Take-over offer from Facebook. The problem is, Facebook wanted the sale to be paid for in Facebook stock, which many think is greatly over-valued. The merger may sound like a good fit but the Twitter folks see bigger opportunities ahead for the company. Give them credit, a tech company that doesn’t aspire to selling out to a bigger fish is becoming increasingly rare. Kara Swicher from All Things D has the story.