NEW YORK (WFAN) — Yankees slugger Alex Rodriguez is locked in — er, make that logged on.

That’s right. The oft-criticized third baseman has started posting to Facebook.

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Though A-Rod joined the social networking site in September 2011, his first post didn’t come until March 30, when he uploaded a photo of himself meeting with fans before a spring training game at Steinbrenner Field.

“I think it’s going to humanize him, and that probably the best thing,” NYU sports management professor Wayne McDonnell told amNY. “It’s the evolution of A-Rod.”

Fan reaction to his page has been swift. The 36-year-old amassed over 723,000 “likes” as of Friday morning.

Most of A-Rod’s updates have come as photos, a peek into the life of baseball’s highest-paid player.

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“Picked up the girls from school and having a little fun,” Rodriguez captioned to Tuesday’s upload, an image of the star with his daughters.

The most recent showed A-Rod outside Tropicana Field: “Arriving at practice. Getting ready for (Friday’s) opener against the Rays.”

In his lone non-photo update, Rodriguez promised he’d “start every week with some positive energy” by sharing an inspirational quote.

The first Monday edition of what he called the “ARod Energy Quote of the Week” came courtesy of legendary UCLA basketball coach John Wooden: “It’s the little details that are vital. Little things make big things happen.”

Fans could also get a glimpse into A-Rod’s interests. His “likes” include Andy Warhol, “Seinfeld,” “Family Ties,” and — of course — the Yankees.

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Are you going right over to “like” A-Rod’s page? Let us know in the comments below…