NEW YORK (TheStreet) -- Over the last few months, many stocks have plummeted from momentum-fueled highs and have left investors feeling queasy.

Some companies attributed their fall to short-selling, others to earnings that did not meet expectations. Four of those that are no longer flying as high as they were are Twitter (TWTR) - Get Report, Sallie Mae(SLM) - Get Report, 3D Systems(DDD) - Get Report and Groupon(GRPN) - Get Report

Twitter has been the most publicized. The social media giant's stock, at $30.75, is down nearly 52% for the year to date and nearly 32% for the last 52 weeks. Shares are currently near an all-time low and the recent lockout expiration hurt shares.

Twitter's problem isn't revenue growth but user growth. Twitter currently has a market capitalization of $17.81 billion, and a one-year target estimate of $44.17.With this in mind, investors are waiting for its next earning report, to be released in late July.

Next up is Sallie Mae, the student loan issuer. The company, more formally known as SLM Corp., currently trades around $8.80, down nearly 67% for the year to date and over 61% for the past 52 weeks.

The company has a one-year target estimate of $10.69. The good thing about this company is its dividend yield, a whopping 6.8%, which could be an enticement for investors.

The 3-D printing company 3D Systems was once a high-flying stock but at $56.70 shares are down 39% for the year to date and up over 22% for the past 52 weeks.

There have been several factors affecting this company. First, the entire 3-D printing industry has been under pressure since the beginning of the year because of speculation. 3D System's competitor Stratesys(SSYS) - Get Report has also been volatile, its shares, at $94, down over 29% for the year to date. All that speculation has kept investors away from both companies. However, 3D System's PEG ratio of 1.3 shows potential for growth.

Finally, Groupon has been super-volatile. At $6.25, shares of the online coupon company are down nearly 47% for the year to date after being as high as $12.76. Over the last 52 weeks, shares are off over 13%.

Groupon's shares dropped 20% earlier this month after the company posted weak guidance when it reported first-quarter report. Still, first-quarter revenue rose 26%, which could make it an investment for those with strong stomachs.

At the time of publication the author had no position in any of the stocks mentioned.

This article represents the opinion of a contributor and not necessarily that of TheStreet or its editorial staff.

>>Read more: Where Twitter's Users Are Going to Come From