Instead of paying user for mentioning your site in post, you can start the signature campaign here.
List of Signature designer is below:

https://bitcointalk.org/index.php?topic=1610428.0

List of campaign manager is below:

https://bitcointalk.org/index.php?topic=4412712.0

If you do not want to take services of campaign manager and want to try your campaign yourself, then escrow the amount.
List of trusted escrower in this forum as below:
https://bitcointalk.org/index.php?topic=5047302.0