Singer and Nickelodeon television star Jennette McCurdy debuts at No. 25 on Billboard’s Social 50 chart as online buzz steadily increases surrounding her and Ariana Grande‘s (of “Victorious” fame, and No. 48 in the tally) new spin-off show, “Sam & Cat,” which begins shooting this month.

The Social 50 chart ranks the most popular artists on YouTube, Vevo, Facebook, Twitter, SoundCloud, Wikipedia, Myspace and Instagram. The chart’s methodology blends weekly additions of friends/fans/followers along with artist pageviews, song plays and reactions.

McCurdy played Sam Puckett alongside Miranda Cosgrove in “iCarly,” a Nickelodeon show which ended its seven-season run this past November. As “Victorious,” another Nickelodeon teen comedy, nears the end of its fourth and final season this February, the series’ Ariana Grande’s character Cat Valentine will live on as McCurdy’s character’s roommate in “Sam & Cat.”

Both have promising budding music careers. McCurdy’s 2011 single “Generation Love” spent seven weeks on the Country Airplay chart and Hot Country Songs, and Ariana Grande has appeared on several “Victorious Cast” releases as well as delivering her own single, “Put Your Hearts Up,” which is available on iTunes.