Bangalore: Following the famous saying of “To Err is Human” even the biggest investors have made much bigger blunders in their career. Startups which are billion dollar companies now were rejected by these VCs at a certain point of time for reasons whatsoever.

Zynga, Foursquare, Twitter and many more successful companies were denied investment by many VCs and Business Insider has compiled a list of VCs who blew the opportunities and carry a great deal of regret.

Let’s take a look at who missed those golden opportunities and what they have to say about it.

1. Charlie O’Donnell

Missed Funding in: Foursquare

The investor from First Round Capital had to let go a funding opportunity because he did not have enough money. He regrets having missed the chance and had even considered borrowing some cash to offer the founders of Foursquare. "I wasn't at a VC fund at the time, but was very tempted to make the offer.  The only problem was that I was $30,000 in the hole from working on my startup and literally didn't have a dime,” says Charlie.