Are there any Facebook Inc. (Nasdaq: FB) skeptics left out there?

I doubt it.

But even early this year, the social-networking giant still had plenty of naysayers on Wall Street. And that was when – on Feb. 27 to be precise – I predicted that Facebook stock would double in value by 2018. And the stock has gone on a huge rally since that day, when it was trading at just shy of $79.

FB recently closed at $106.50, giving those of you who picked it up at the time a 35.5% gain in little more than eight months. If that doesn’t sound like much to you, consider this. During that same period, the market-reflecting S&P 500 Index is down by 2.6%. Of course, after a big run like that, you’re likely wondering if there is any upside left.

Should you get out now? Is it too late to make your “Buy”?

This is what I think…

All in on Facebook Stock

The answer is “no.”

No, you shouldn’t sell your shares – and no, it’s not too late to take a stake in Facebook.

In fact, I’m “doubling down” on my original prediction by raising my FB price target to $250.

I’m one of the few tech analysts who’s stood by Facebook when others were slamming it. You may recall, back on March 7, 2014, when I noted that Facebook had become the laughingstock of the Nasdaq.

The company had just agreed to pick up the instant-messaging service WhatsApp for $19 billion. That five-year-old startup had just 55 employees and 2013 revenue of $20 million. And Wall Street, cable TV pundits, and late-night comedians hurled sarcasm at the Silicon Valley leader.

But here’s what I said: “Facebook founder and CEO Mark Zuckerberg will have the last laugh here.

“And if you follow my recommendation… so will you.”

Since then, the stock is up 58.6%, beating the S&P 500 more than fourfold.