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Do you use only captcha breaker to solve captchas for T1 or human captcha solvers as well?Out of curiosity who is list provider?
Generally, you would want to keep your tier 1 campaigns the most stable of your links, these links will be the foundation of your websites’ link profile, you don’t “normally” want to use spammy tools and/or spammy link types at the tier 1 level that are here today and gone tomorrow because it doesn’t look good on your money site, if 100 sites have recommended your site today and then tomorrow 99 of those sites have been wiped off the face of the earth.So, back to the question, if you don’t have any alternative platforms to build tier 1 links, that’s fine but don’t expect solid, longterm rankings, you may be able to get a good year or two if you’ve spammed enough IPs though! Stick to platforms that have their own long term links that do not move, such as contextual, people way back always said that contextual links were the best because of the content surrounding the anchor texts and the relevance, but I don’t believe this to be 100% accurate, I believe it is simply because the anchor link you put within an article (contextual link source) is stable and normally articles are kept on sites much longer than a comment or a track back as these fall off onto other pages after a while which moves the backlink onto a page with no link juice to offer. Sorry I do make mountains out of molehills but I hope you’ve got a good understanding about tier 1 ser campaigns now.
You can use web2.0s for tier 1. No matter how quality the platform is you still need to control your quality. Example . If you build a backlink on high quality web2.0 such as blogspot and then add junk content it won't last longer and not passing good juice. I believe content is the king for tier 1 . I even use gsa ser links to tier 1 or even money site directly. It really doesn't matter as long as you do quality control.