For reasons having nothing to do with the players’ athletic abilities, the Harvard baseball team was on NBC’s “Today’’ show Thursday. So why was a ball club that finished the season with a lackluster 7-8 record invited to hang with Al Roker? Because they’re a YouTube sensation. A few weeks ago, the guys shot a silly video of themselves lip-synching to the Carly Rae Jepsen hit “Call Me Maybe,’’ and the vid’s gone viral. Since being posted May 6, the cleverly choreographed clip has been viewed over 7 million times. (Shot in the team van during a road trip to Dartmouth, the video was directed and filmed by Harvard senior Connor Hulse.) The team’s appearance on “Today’’ followed earlier shout-outs from, among others, ESPN, Huffington Post, Justin Bieber’s manager, and Jepsen herself, who retweeted the video. (Capitalizing on the success of the video, members of the Southern Methodist University women’s rowing team made a version of their own, which earned them an invite from “Today,’’ too.) To their credit, the Harvard players are using their newfound, if fleeting, stardom to do some good. When they realized that the video was taking off, they added a link to the Friends of Jaclyn Foundation, an organization that supports children with pediatric brain tumors. “If half the people that watch the video click the link we put under the video, hopefully we will raise awareness and some money for them,’’ senior Jon Smart told the Harvard Crimson.