Tumblr as TIER 1??

Is a bad idea have tumblr blog as a tier 1 backlink? If not do i have to create multiple accs on tumblr, or it is ok to just make new blogs on 1 acc? Btw:I'm curently making 3 articles per 300-1000 words, that should be ok, or not? And when i post article with my backlink is better to drop it just once, or two keywords per one url? ( i saw that in someones SEO package here)
Yesterday i finally rank hardest KW for me so far (for you it is probably low or medium comp), but since that i have all kinds of motivation to work. Thanks for help and sorry for my english.

I would create new accounts and mix it up with other link sources

How can it be bad if you are talking about one link?
One link is not bad unless it's from a North Korean hate site or whatever. Hell, what's to stop someone with a tumblr account linking to you anyway? (wow - REAL natural linking - imagine that)

The days of Tumblr farms are pretty much dead, but a link or two. Fine.

Scritty

Scritty said:

How can it be bad if you are talking about one link?
One link is not bad unless it's from a North Korean hate site or whatever. Hell, what's to stop someone with a tumblr account linking to you anyway? (wow - REAL natural linking - imagine that)

The days of Tumblr farms are pretty much dead, but a link or two. Fine.

Scritty

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I thought about 2-5 unique tumblr blogs to link to my money site (to mix things up with other 2.0) + i want to do this for several of my sites, so that is why i asked, if it is okay to have it from one tumblr acc, because yesterday when i setted up few tumblr blogs i didn't find anything linking to acc, but maybe i missed something..

Yes, they are fine but limit them to a few. Get proper platform diversity while focusing upon good quality content.

gulzarchef said:

Yes, they are fine but limit them to a few. Get proper platform diversity while focusing upon good quality content.

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Please stop the content is king bullshit, it isn't, backlinks are God, king and queen in SEO, content is the joker at best.