How many website can be track with facebook pixel?

[mi2]

I have few website on different niche, I want to create custom audience for each niche on facebook but I am confused one think, I have one pixel so how I will create custom audience for each site? do I have to just create custom audience and use the same pixel for all sites?

 

[amar478]

The Facebook pixel could be a piece of code for your web site that permits you to live, optimize and build audiences for your ad campaigns. With the Facebook pixel, you can: live cross-device conversions: See however your customers square measure moving between devices before they convert.