Organizations such as The Poetry Foundation and the American Academy of Poets feature the work of published, respected poets or the recipients of poetry awards. A simple search at these sites with the term "friends" as a keyword or subject brings up hundreds of poems.
An initial keyword search at The Poetry Foundation's site brings up poems about friends, after which the search can be further refined by classifiers such as occasion (for example, the death of a friend) or the poetry's period (such as Beat or Victorian poetry). The American Academy of Poets' site allows searches by occasions, subjects, forms and specific poetry movements. These sites feature the best of poetry according to well-qualified reviewers and well-respected poetry scholars.
Poetry about friends can be found on hundreds of poetry websites, but these sites are not all equal. Many sites are hosted by individuals or organizations that don’t evaluate content carefully before it’s published. Other poetry websites may feature the work of poets who have paid to have their poem appear on the site, while others simply accept all contributions so that they can build up their content. These sites tend not to feature poetry writing at its best; while there may be some diamonds in the rough, it may require a little more work to find them.