Last month we reported that the flat (or negative) June-to-July numbers seen across almost all social network sites was perhaps indicative of a lull within the industry as a whole, and for aficionados the August data makes for grim reading.

Twitter gained just 1.27% month-on-month between July and August 2009, registering 23,579,044 unique visits (reports Compete.com).

Twitter Growth Just +1.27% For August; Facebook Down -0.37%

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Meanwhile, Facebook dipped 0.27% to a still heady 122,220,617 uniques. When was the last time Facebook lost ground month to month? Has it ever?

On the other side of the table, new Facebook purchase Friendfeed gained a massive 13.75%, moving above the one million unique mark for just the third time in its history, likely because of all the new attention. It will be interesting to see if Friendfeed can continue this upward momentum from here, and even if it does whether that in any way guarantees the future of the highly-regarded aggregator.

LinkedIn also continued its recent advance, adding 8.19% uniques (14,241,651).

MySpace fell 6.73% (55,599,585 uniques), and looks to be on the verge of a major decline.