Technically (traditionally) is is correct. Current usage, however, is making are much more common (and comfortable for some people). Let your audience be your guide.
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LaboriousI think the sentence with is is correct, since 'none' takes a verb form which goes with a singular subject. Am I right about this, please?In the strict grammatical subject/verb agreement, that is right. However, native speakers would use the rule of proximity agreement, and select the verb that agrees with the plural "friends."