As we’ve mentioned a number of times, Twitter has been gradually tip-toeing further and further into the media business for some time now. It has already become a real-time newswire for many, a source of breaking news and commentary on live events, and now — with the launch of curated “hashtag pages” like the one it launched late last week for a NASCAR event — it is showing signs of becoming a full-fledged editorial operation. It may not be hiring investigative reporters, but the areas of overlap between what it does and what media companies do is growing, and so is its attractiveness to the advertisers that media entities desperately need to hang onto. Read the full story at GigaOM.