Again, only if you assume that these memes aren't covered by article 9. You might be able to infer a lot about someone from their authored or favorites memes. Article 9 doesn't just cover the personal data itself, it covers personal data revealing ethnicity, political opinion, etc. If I look at a user's list of authored memes, and it's full of pro gay rights memes have these memes revealed their political opinion? Many would argue yes, and processing memes is definitely the core activity of our hypothetical site.
