Reddit, the 15-year-old online news aggregator and discussion forum, has agreed to buy lip-synching video app Dubsmash, one of the few remaining startups to rival TikTok, according to two people with direct knowledge of the deal.

The acquisition, originally set to be announced on Monday, marks an unexpected push by Reddit into mobile video, along with the opportunity to grow its user base and ads business.  Shortly after this story was published Sunday, Reddit announced the acquisition on its company blog, with CEO Steve Huffman saying that “our community-focused platforms can coexist and grow as we learn from each other.”