"I've had a lot of conversations with investors this quarter … sentiment was far and away the most negative on Twitter," he said.
Mahaney highlighted two important catalysts to Twitter's future growth that investors should be watching: its monthly active users, and user-engagement figures. These metrics, he said, should start to accelerate at some point before the end of the year.
Despite the fact that Mahaney's $60 price target represents a 40 percent premium to the stock's $41.44 closing price, he said the micro-blogging site is not his top pick in the sector right now.
That distinction goes to social media competitor Facebook.
"If you're going to buy one of these stocks, I'd prefer Facebook to Twitter," he said.
Guy Adami of stockMONSTER.com agreed with Mahaney's call.
"I'm still in the camp that Facebook's going to $75 ahead of earnings. I think analysts are going to have to catch up," he said.
—By CNBC's Michael Newberg
Disclosures: RBC Capital Markets is currently providing Facebook, Inc. with non-securities services; RBC Capital Markets has provided Facebook, Inc. with investment banking services in the past 12 months; A member company of RBC Capital Markets or one of its affiliates managed or co-managed a public offering of securities for Facebook, Inc. in the past 12 months; A member company of RBC Capital Markets or one of its affiliates received compensation for investment banking services from Facebook, Inc. in the past 12 months; RBC Capital Markets has provided Facebook, Inc. with non-securities services in the past 12 months; No disclosures found for Twitter, Inc.