On the contrary I believe you would have broken a rule that's why you got a ban. Usually posting a lot can be termed as spamming and if that was what you were doing, it could be a reason. Facebook is still one of the largest social media we have with a large influx of users. Although the age bracket using it now isn't same as the age bracket using it few years ago as the younger generation now prefers Instagram and Twitter to Facebook but then a lot of groups are earning a lot of money from Facebook.
@dreemport brought me to your post.