Someone who uses the site youtube.com to post video blogs, videos, and such.

Someone who makes videos for YouTube as a career.

A person on YouTube with their own account that makes videos and/or watches videos on YouTube .

Some one who Vlogs (video blog) and post it to youtube. They are usually of people who walk around with a camera. Very entertaining.

A person that uses a site called YouTube and is either famous or just started a career

A youtube guy or women that have been doing it for a long time

A person who makes videos on YouTube . At 25,000 subscribers, most YouTubers will receive an email requesting a YouTube Partnership (ads will be placed at the beginning of your videos and for every ad seen or clicked, you will earn money). You will also receive play button plaques in the mail according to when you hit a certain number of subscribers.

25,000: Copper Plaque
(Guesstimation) 50,000, 100,000, or 500,000: Silver Plaque
1,000,000: Gold Plaque
10,000,000: Diamond Plaque