All down to "likes" and has nothing to do with gtower skill or cultivation results.
Basically, the more you flood this site with content, the more chances you get to gather "likes" and the faster you move up the levels.
You could post hundreds of items about rubbish and become a grand master without having any real skill in growing at all!
Unless you are an ego maniac, I wouldn'y worry about labels/levels and just concentrate on your growing skills, the only person you have to please is yourself, virtual friends are not real friends.
There have been some semi naked ladies with their plants that get a lot of likes, but can they grow dope dope is the question.
Other times you get people who have agreements to "like" whatever the other one posts to inflate their scores, which is cheating in my book.