With less than 40 trading days to go in 2013 and markets hovering near all-time highs, the traders kicked off a big week of "Fast Money" by tackling the crude reality of a four-month low in the price of oil.
On Monday, Brian Kelly of Brian Kelly Capital said that "most of this is a supply issue … you're really seeing that oversupply coming into the U.S."
Guy Adami of StockMonster.com took the opposite view, saying that falling crude prices could be caused by a lack of demand. But he added there are still ways to make money in the energy space, citing Exxon Mobil and Newfield Exploration among his favorite picks.
Metropolitan Capital Advisors' Karen Finerman highlighted a different way to trade the move. "A name like a Wal-Mart, if we see gas prices continue to go lower, that can't be bad for them," she said.
Dennis Gartman of The Gartman Letter reiterated his view that crude has more downside ahead. "I think WTI can make its way down to $85," he said. That would signal another 10 percent to drop for oil.
Gartman agreed with Kelly that the price drop is a supply issue, citing domestic production and renewed Libyan output as catalysts. He also said that cheaper crude could have wide-ranging effects across the alternative energy space.
"If crude oil makes its way lower, I think it spells the demise of the solar energy phenomenon," he said.
The traders also debated the equity markets Monday with Jeremy Siegal of the Wharton School of Business. The professor stuck to his bullish thesis, saying that the could blow through new record highs by year's end.
"Seventeen [thousand] ... it could happen," he said.
(Read more: Jeremy Siegel sticks to his bullish outlook)
When pressed about the recent weakness of the Russell 2000 small-cap index, Siegel said that he didn't think it was enough to kill the rally.
"The breadth of the market has been very, very strong," he said. Siegel's remarks coincided with a pair of bearish comments from Wall Street analysts. Citigroup's Tobias Levkovich warned about investor euphoria, saying that a market pullback could be around the corner, while technician Tom DeMark of Market Studies said small caps could be running out of steam.
One company that appeared to be doing that Tuesday was Tesla. The company, which had been up more than 400 percent this year, fell 11 percent in after-hours trading following its third-quarter earnings report.
(Read more: Bull market has 5 years ahead of it: Tom Barrack)
CNBC's Phil LeBeau explained why the stock tanked despite a beat on the top and bottom lines.
"The numbers were better than expected, but they were not as high as many people were hoping," he said. Model S deliveries were a specific data point that beat Tesla's expectations but failed to impress the Street. According to LeBeau, the reported 5,500 third-quarter deliveries were not as high as many had projected.
(Read more: LeBeau: Model S puts heat on Tesla)
Tim Seymour of Triogem Asset Management called Tesla's valuation "absurd" and said it was a stock he wouldn't want to own. Similarly, Guy Adami said Tesla is in "no-man's land," adding that the quarter seemingly looked great but that a high "whisper number" reflected lofty expectations. R.W. Baird Senior Research Analyst Ben Kallo agreed, saying that investors got over their skis with unrealistic hopes for the quarter.
High hopes abounded for microblogging site Twitter on Wednesday, just one day ahead of its initial public offering. PrivCo's Sam Hamadeh said he valued the company at $30 to $33 a share and predicted that the stock would pop the first day of trading. RiskReversal's Dan Nathan agreed, saying the stock "could be a bubble in a heartbeat."
According to Hamadeh, investors could expect Twitter to use funds from its IPO for future acquisition activity. "Twitter has a massive M&A shopping list. … They have a massive appetite to buy companies," he said.
(Read more: What a lemon! Tesla's a $50 stock, analyst says)
Channing Smith of Capital Advisors had a very different view of the most hotly anticipated IPO since Facebook.
"It's probably the most expensive IPO on a price-to-sales basis we've ever seen," he said. Smith cited a slowdown in monthly active users and timeline views as troubling. "We're not confident that the business model will be as broad or as successful as a Facebook or a Google."
On Thursday, questions about how Twitter would perform were answered when the stock skyrocketed more than 70 percent its first day of trading.
Hamadeh at PrivCo returned to give his IPO analysis. "I think Twitter will grow into its valuation," he said. "I don't think you can say it's way overvalued."
As traders finally got the chance to get a piece of Twitter, "Fast Money" looked ahead to what could be the next hot social media IPO. Pinterest, a social scrapbooking site that lets users share their interests, recently raised $225 million in a round of funding, valuing the company at $3.8 billion.
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Rick Heitzmann of FirstMark Capital was the first institutional investor in Pinterest and joined the crew to talk about it. He said an IPO is "part of the plan" but that for now the company is still growing its business. While Pinterest is still in its early stages of monetization, Heitzmann did point to one promising metric.
"Over half of the users are on the mobile device," he said, which could be a key factor when it comes to monetizing mobile ads.
Catch all the action on "Fast Money," weekdays at 5 p.m. ET on CNBC.