Celery | 165 followers on LinkedIn. Celery emerged from Y Combinator in 2012 with one goal: to help you sell your great ideas, better. Filling a void in e-commerce, Celery has become the single-stop for innovative brands – large and small – to take pre-orders, crowdfund independently, and to continue selling before and after items are in-stock. Today, Celery has helped thousands of businesses launch their way by providing the tools to crowdfund and pre-sell independently.