This really depends on the type of ad, and where you are placing the ad.
For example, the new JMT gateway is best served using a site where people already know you. They get to see your photo, what you've achieved, and a general description of SFI. If they know and trust you, then this can be a very compelling landing page to convince somebody to sign up. In this case, your ads should be pointing to your blog, and from there they can continue on to your JMT Gateway.
On the other hand, if you want to advertise the PB Auctions, then the ads should go directly to the PB gateway. Same for the TC ads, they should also go to the gateway for TC. If you direct them to a blog, then they may feel tricked, and that you're trying to mislead them.
Your advertising efforts should have a reason for being done. Don't just blindly throw up ads and hope for the best. Think about what you would expect if you read the ad, and were interested to know more.
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This really depends on the type of ad, and where you are placing the ad.
For example, the new JMT gateway is best served using a site where people already know you. They get to see your photo, what you've achieved, and a general description of SFI. If they know and trust you, then this can be a very compelling landing page to convince somebody to sign up. In this case, your ads should be pointing to your blog, and from there they can continue on to your JMT Gateway.