Daily deals website (and Groupon competitor) LivingSocial is driving significant revenue for consumer brands, at least according to these figures on Mashable.

Companies including Starbucks, Amazon, and McDonalds are using LivingSocial to offer big discounts on stock; providing consumers with great value, and themselves with a revenue shot.

And that shot is pretty significant...

Starbucks broke the record for most units sold in a single deal yesterday with 1.5m sales of a $10 gift card discounted to $5: that's $7.5m of revenue in one day, from one site.

And that's small fry compared to the $11.5m Amazon generated earlier in the year, when it sold 1.15m $20 gift cards discounted to $10.

It's hard to gauge the long-term value retailers will get from such sites, and Groupon's struggles since floating suggest that the sector's future may not be clear cut - but revenue figures like those above should at least ensure a steady flow of companies looking to test bulk-discounting for themselves.