YouTube is a free video sharing website that allows users to watch, upload, and share videos. It's one of the most popular websites in the world, and is used for entertainment, education, and to find information.

Facebook is a social networking site that lets people connect with friends and family, share photos and videos, and learn more about people they meet. 

Threads is a social media, microblogging service operated by Meta Platforms.

Instagram is a social media app that allows users to share photos and videos. It also has a messaging system and features like filters and hashtags.

TikTok is a social media app that allows users to create, share, and discover short videos. It's known for its personalized feeds of videos set to music and sound effects.