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can i use four different types of website in forum signature ?

Yes You Can , As you Did , You may Point out to Any of Website over Web You Like as I Linked . But Try to Do it Like my sign. .
Thanks

Of course!
This will more effective for your website.

Why not dear, Of-cause!

Yes off course, you can use different websites in forum signatures.Forum Signatures help you to increase the traffic of your websites.

Of course!
You can use to it.

There is not any issue in using four different types of website in forum signature.

yes, you can can use different websites in your forum signature.

forum signature is more helpful for increase your website backlinks.

yes, It possible to use different sites in forum signature.

yes you already did it. you can include 4 different types of websites in forum.

yes in that forum you use but some forum not.

Yes you did it. you can use different types of website links in a single forum signature. Do-follow forum signatures will help to boost your site ranking position in all search engines.

Isn't it spamming a site? Looks like you have four signatures now.

Yes you can in this forum..But also Depends upon the forum rules and regulation.