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hello @journeyoflife, the reason is that steem is the coin,and the "old logo " as you put it is the logo for that coin ! Steemit is just one of many platforms of this said coins distribution ! There has been quite a bit of confusion over this and so i do believe that its a good idea to keep this clear in the minds of all of the steem users community !I actually like the Logo, the meeting of two ideas, nice, very Jing and Jang too, the balance or consensus of ideas ! I shall write a post tomorrow on this I think ! Steem On )

Unfortunately the old logo had to change because Steem is going to be used for many other apps that are coming out soon. Steemit can't claim Steem for itself anymore. It's kind of sad.

That being said, we could have done a better job with the new logo. I hope they consider modifying it.