Their value is in shipping fast. If competitors are working on the same feature and manage to roll it out of the door first, that spells trouble. First versio

Their value is in shipping fast. If competitors are working on the same feature and manage to roll it out of the door first, that spells trouble. First version of Twitter was an almost complete re-write because of performance issues. But since their concept was dead simple, they had to get market shares fast else someone else was going to be there first.