YouTube was created in 2005 as a video sharing website where users can upload, share, and view videos. It allows quick uploading and embedding in social media. While it provides wide reach, videos may lack context and ads can interfere with content. Social change activists have used YouTube successfully to raise awareness of issues like bullying and support charities through creative projects that engage audiences and encourage action. The Obama presidential campaign also leveraged YouTube's capabilities to spread its message and mobilize supporters.