Who do they need a social network ? are people going to move from Facebook or Twitter to Tumblr? No. They need a good an new idea , an innovative product that will draw attention. and a consistent strategy . People are fed up with social networks ( i.e. Google+ ).

Tumblr is not valuable at all for advertisers , unless you are selling porn...

What's Yahoo mobile strategy ? What's Yahoo's cloud strategy ? ect ...

I see no strategy , only buzz ...

I'm sure plenty of engineers at Yahoo have great ideas ,it's just feel like what's really broken is Yahoo's management. Why would they pay that much for Tumblr, really ?

>are people going to move from Facebook or Twitter to Tumblr? No.

Huhwhat? Of course they are. Do you not have friends doing this already?

I have zero friends that have left Facebook or Twitter for Tumblr.

I have a number of friends that have added Tumblr, but they haven't left anything.

Because I think social networks are the future, they will be to future generations what the world wide web has been up until today. Ignoring social networks today would be like ignoring the www in the mid 90s (aol online, msn).

Just because social networks are the future doesn't mean Yahoo needs to take on facebook head on (see: Google+).

Plus, Tumblr IS a social network, just not built in the image of facebook. So is instagram, youtube etc.