If you haven’t noticed, Twitter is slowly but surely taking over online, adding video and music to its already wildly popular service and attracting new users (their product) and advertisers (their pay day) in droves.

And just when you thought they were full to the brim with new business, the greedy little bird comes back out for more – and this time it appears they plan to target Foursquare’s worm.

How so? Well, Twitter is rumored to be working on local tweet discovery and once they’ve nailed THAT (and they will), how long till they start offering this service (with offers targeting local tweeters) to their advertisers? And that’s the EXACT value proposition Foursquare peddles.

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