A hot topic; something that everyone keeps talking about — a subject that dominates conversation/media attention.
その映画の話題で街は持ちきりだ。
The town is buzzing about that movie.
新製品の発表でメディアは持ちきりだった。
The media were all talking about the new product launch.
最近、SNSではあの事件が持ちきりだ。
Recently, that incident has been all over social media.