As far as I can see there is no rule against posting news content from other sources that you think would be interesting to the community (especially when you provide a link to the source, which I always do). From Steem's own FAQs:

"Steem is an open platform meant to host and welcome any legal content. Users can post anything they want, whether it be phrases, quotes, blogs, anecdotes, photos, videos, memes, songs, and more. Be creative!"

If I am mistaken about the rules please let me know.