Only super-new users get points for upvoting memes, which is just the first couple you upvote. Everyone gets points for commenting, and you get more points for meme comments than plain text comments. It's also impossible to comment 200 times in an hour, because of the comment timer, which makes you wait a certain amount of seconds to comment again if you've been commenting a lot.
Other ways you can gain points:
1. Make memes (4 points)
2. When people upvote your memes (40 points)
3. Comment (I think 2 for text, and 4 for meme)
4. When people upvote your comments (30 points)
However, if you're here just for the points, you won't have much fun. It's a lot more enjoyable to make friends, have a laugh, chat with other users in the comments, etc. If you're having fun, the points will come easily.