Receiving virus threat while opening Pinterest on iPhone

I’m having problems with Pinterest. Every time I try to ‘visit’ a site I get a message saying that my iPhone has been hacked. There are two. One says that, if I don’t click on the link and install a certain app all my details and photos will be sent to my contacts. The other says I have been infected with 16 viruses and gives me two minutes to click on the link before all the information on my iPhone is stolen.

I think it is a scam but it is stopping me from using Pinterest as it keeps popping up.

I haven’t clicked on any links. Has anyone else had this?

Thanks.

[Re-Titled by Moderator]