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Twitter shares to rally more than 60%: Analyst

One of Twitter's biggest bulls is making a bold call on improving user growth.

MKM Partners analyst Rob Sanderson has a buy rating on Twitter and 12-month price target of $61, representing more than a 60% rally.

"I think this is the year where we start to see product improvement turn the trajectory of user growth. If that's correct, I think there will be a pretty meaningful revaluation of the stock higher," Sanderson said on CNBC's "Fast Money Halftime Report."

Twitter's revenue growth is stronger than Facebook's was during its first quarter's as a public company, according to Sanderson.

"Twitter is outpacing Facebook revenue growth. Growth rates are much higher with directional correlation for every quarter on record," Sanderson wrote in a note to clients.

Twitter CEO Dick Costolo's future lies within user growth, Sanderson said.

"If we turn around and start to see more accelerated growth in 2015 then he's considered a good CEO. If he doesn't, he will probably be shown the door," Sanderson said.