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I was just wondering why Facebook and now Twitter have added "#!" into the url structure? Does this mean we should link to a twitter profile like this - twitter.com/profile -  anymore?

Should we now be linking like this: twitter.com/#!/kevinbarnes

Kevin

If I have 10 links coming from 10 Tumbler blogs.. Do they count as 10 linking domains or 1 linking domain coming from tumbler.com?

Does the authority of links coming from tumbler decrease the more I get links from tumbler blogs?

Thanks