In this video from Monday's Investor Beat, host Alison Southwick and Motley Fool analysts Taylor Muckerman and Morgan Housel look at the biggest stories facing investors from the market today.

Shares of Caterpillar (NYSE:CAT) are up today after beating analyst expectations for the fourth quarter, with construction sales buoying plunging sales for mining equipment. Shares of Facebook (NASDAQ:FB) fell today despite analyst predictions of a 50% increase in revenue year over year when it reports earnings on Wednesday. Morgan attributes the fall to last week's Princeton study, which claimed that Facebook will lose 80% of its users in three years' time. Facebook's news also dragged down other social-media stocks today, including Twitter (NYSE:TWTR). And Sprint (NYSE:S) saw a nice little bump today, after announcing that it has expanded its 4G LTE network to 40 more markets in the United States. In this segment, the guys discuss four stocks making moves on the market today.

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