After 15 years in the K-pop industry, TVXQ! is still finding new accomplishments to land.

The legendary Korean outfit makes their debut on Billboard's Social 50 chart this week, starting at No. 29 as the week's only new entry. For the week of Dec. 21 to 27, TVXQ! saw a slew of activity on Twitter, earning 4,000 new Twitter followers (up 411 percent from last week), 16,000 Twitter mentions (up 64 percent) and 173,000 Twitter reactions (up 922 percent). The group also saw a surge in Wikipedia activity, earning 5,000 Wikipedia views (up 23 percent).

The Social 50 is powered by data tracked by music analytics company Next Big Sound and ranks the most popular artists on Facebook, Twitter, Instagram, YouTube, Wikipedia and Tumblr. The chart's methodology blends weekly additions of friends/fans/followers along with artist page views and engagement. The chart’s latest tracking week ended Dec. 27 and sees the first four slots occupied by K-pop acts including TVXQ!'s labelmates EXO and NCT (at Nos. 2 and 3, respectively).