There are various differences between those two applications. Threads doesn’t have DM yet, which means you can’t send messages to other followers, but Zuckerberg may add this feature in the future according to users’ needs. The other different feature is the new app is connected to Instagram. You can transfer your Instagram users to Threads quickly; therefore, you can continue sharing your posts without any differences. The most significant advantage of this new space is you can make ads for your new brands on Instagram and share new ideas and news about your projects on both platforms.